pgsql: Add support for Windows codepages 1253, 1254, 1255, and 1257 and

Log Message:
-----------
Add support for Windows codepages 1253, 1254, 1255, and 1257 and clean
up a bunch of the support utilities.

In src/backend/utils/mb/Unicode remove nearly duplicate copies of the
UCS_to_XXX perl script and replace with one version to handle all generic
files. Update the Makefile so that it knows about all the map files.
This produces a slight difference in some of the map files, using a
uniform naming convention and not mapping the null character.

In src/backend/utils/mb/conversion_procs create a master utf8<->win
codepage function like the ISO 8859 versions instead of having a separate
handler for each conversion.

There is an externally visible change in the name of the win1258 to utf8
conversion. According to the documentation notes, it was named
incorrectly and this changes it to a standard name.

Running the Unicode mapping perl scripts has shown some additional mapping
changes in koi8r and iso8859-7.

Modified Files:
--------------
pgsql/doc/src/sgml:
charset.sgml (r2.75 -> r2.76)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/charset.sgml.diff?r1=2.75&r2=2.76)
func.sgml (r1.306 -> r1.307)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/func.sgml.diff?r1=1.306&r2=1.307)
pgsql/src/backend/utils/mb:
README (r1.4 -> r1.5)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/README.diff?r1=1.4&r2=1.5)
encnames.c (r1.28 -> r1.29)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/encnames.c.diff?r1=1.28&r2=1.29)
wchar.c (r1.53 -> r1.54)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/wchar.c.diff?r1=1.53&r2=1.54)
pgsql/src/backend/utils/mb/Unicode:
Makefile (r1.9 -> r1.10)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/Makefile.diff?r1=1.9&r2=1.10)
iso8859_7_to_utf8.map (r1.1 -> r1.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/iso8859_7_to_utf8.map.diff?r1=1.1&r2=1.2)
koi8r_to_utf8.map (r1.1 -> r1.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/koi8r_to_utf8.map.diff?r1=1.1&r2=1.2)
utf8_to_iso8859_7.map (r1.1 -> r1.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/utf8_to_iso8859_7.map.diff?r1=1.1&r2=1.2)
utf8_to_koi8r.map (r1.1 -> r1.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/utf8_to_koi8r.map.diff?r1=1.1&r2=1.2)
utf8_to_win1250.map (r1.1 -> r1.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/utf8_to_win1250.map.diff?r1=1.1&r2=1.2)
utf8_to_win1251.map (r1.1 -> r1.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/utf8_to_win1251.map.diff?r1=1.1&r2=1.2)
utf8_to_win1252.map (r1.3 -> r1.4)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/utf8_to_win1252.map.diff?r1=1.3&r2=1.4)
utf8_to_win1258.map (r1.1 -> r1.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/utf8_to_win1258.map.diff?r1=1.1&r2=1.2)
utf8_to_win866.map (r1.1 -> r1.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/utf8_to_win866.map.diff?r1=1.1&r2=1.2)
utf8_to_win874.map (r1.1 -> r1.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/utf8_to_win874.map.diff?r1=1.1&r2=1.2)
win1250_to_utf8.map (r1.1 -> r1.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/win1250_to_utf8.map.diff?r1=1.1&r2=1.2)
win1251_to_utf8.map (r1.1 -> r1.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/win1251_to_utf8.map.diff?r1=1.1&r2=1.2)
win1252_to_utf8.map (r1.3 -> r1.4)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/win1252_to_utf8.map.diff?r1=1.3&r2=1.4)
win1258_to_utf8.map (r1.1 -> r1.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/win1258_to_utf8.map.diff?r1=1.1&r2=1.2)
win874_to_utf8.map (r1.1 -> r1.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/win874_to_utf8.map.diff?r1=1.1&r2=1.2)
pgsql/src/backend/utils/mb/conversion_procs:
Makefile (r1.15 -> r1.16)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/Makefile.diff?r1=1.15&r2=1.16)
pgsql/src/backend/utils/mb/conversion_procs/utf8_and_cyrillic:
utf8_and_cyrillic.c (r1.12 -> r1.13)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/utf8_and_cyrillic/utf8_and_cyrillic.c.diff?r1=1.12&r2=1.13)
pgsql/src/bin/initdb:
initdb.c (r1.109 -> r1.110)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/initdb/initdb.c.diff?r1=1.109&r2=1.110)
pgsql/src/include/mb:
pg_wchar.h (r1.66 -> r1.67)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/mb/pg_wchar.h.diff?r1=1.66&r2=1.67)
pgsql/src/test/regress/expected:
conversion.out (r1.11 -> r1.12)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/conversion.out.diff?r1=1.11&r2=1.12)
pgsql/src/test/regress/sql:
conversion.sql (r1.8 -> r1.9)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/conversion.sql.diff?r1=1.8&r2=1.9)

Added Files:
-----------
pgsql/src/backend/utils/mb/Unicode:
UCS_to_most.pl (r1.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/UCS_to_most.pl?rev=1.1&content-type=text/x-cvsweb-markup)
utf8_to_win1253.map (r1.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/utf8_to_win1253.map?rev=1.1&content-type=text/x-cvsweb-markup)
utf8_to_win1254.map (r1.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/utf8_to_win1254.map?rev=1.1&content-type=text/x-cvsweb-markup)
utf8_to_win1255.map (r1.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/utf8_to_win1255.map?rev=1.1&content-type=text/x-cvsweb-markup)
utf8_to_win1257.map (r1.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/utf8_to_win1257.map?rev=1.1&content-type=text/x-cvsweb-markup)
win1253_to_utf8.map (r1.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/win1253_to_utf8.map?rev=1.1&content-type=text/x-cvsweb-markup)
win1254_to_utf8.map (r1.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/win1254_to_utf8.map?rev=1.1&content-type=text/x-cvsweb-markup)
win1255_to_utf8.map (r1.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/win1255_to_utf8.map?rev=1.1&content-type=text/x-cvsweb-markup)
win1257_to_utf8.map (r1.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/win1257_to_utf8.map?rev=1.1&content-type=text/x-cvsweb-markup)
pgsql/src/backend/utils/mb/conversion_procs/utf8_and_win:
Makefile (r1.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/utf8_and_win/Makefile?rev=1.1&content-type=text/x-cvsweb-markup)
utf8_and_win.c (r1.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/utf8_and_win/utf8_and_win.c?rev=1.1&content-type=text/x-cvsweb-markup)

Removed Files:
-------------
pgsql/src/backend/utils/mb/Unicode:
UCS_to_8859.pl
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/UCS_to_8859.pl)
UCS_to_BIG5.pl
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/UCS_to_BIG5.pl)
UCS_to_GBK.pl
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/UCS_to_GBK.pl)
UCS_to_JOHAB.pl
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/UCS_to_JOHAB.pl)
UCS_to_UHC.pl
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/UCS_to_UHC.pl)
UCS_to_WIN874.pl
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/UCS_to_WIN874.pl)
UCS_to_WINX.pl
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/UCS_to_WINX.pl)
UCS_to_cyrillic.pl
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/UCS_to_cyrillic.pl)
pgsql/src/backend/utils/mb/conversion_procs/utf8_and_win1250:
Makefile
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/utf8_and_win1250/Makefile)
utf8_and_win1250.c
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/utf8_and_win1250/utf8_and_win1250.c)
pgsql/src/backend/utils/mb/conversion_procs/utf8_and_win1252:
Makefile
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/utf8_and_win1252/Makefile)
utf8_and_win1252.c
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/utf8_and_win1252/utf8_and_win1252.c)
pgsql/src/backend/utils/mb/conversion_procs/utf8_and_win1256:
Makefile
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/utf8_and_win1256/Makefile)
utf8_and_win1256.c
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/utf8_and_win1256/utf8_and_win1256.c)
pgsql/src/backend/utils/mb/conversion_procs/utf8_and_win1258:
Makefile
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/utf8_and_win1258/Makefile)
utf8_and_win1258.c
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/utf8_and_win1258/utf8_and_win1258.c)
pgsql/src/backend/utils/mb/conversion_procs/utf8_and_win874:
Makefile
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/utf8_and_win874/Makefile)
utf8_and_win874.c
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/utf8_and_win874/utf8_and_win874.c)