pgsql: Allow MOVE FORWARD n, MOVE BACKWARD n, MOVE FORWARD ALL, MOVE

Log Message:
-----------
Allow MOVE FORWARD n, MOVE BACKWARD n, MOVE FORWARD ALL, MOVE BACKWARD ALL
in plpgsql. Clean up a couple of corner cases in the MOVE/FETCH syntax.

Pavel Stehule

Modified Files:
--------------
pgsql/doc/src/sgml:
plpgsql.sgml (r1.142 -> r1.143)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/plpgsql.sgml?r1=1.142&r2=1.143)
pgsql/src/pl/plpgsql/src:
gram.y (r1.127 -> r1.128)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/pl/plpgsql/src/gram.y?r1=1.127&r2=1.128)
pl_funcs.c (r1.80 -> r1.81)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/pl/plpgsql/src/pl_funcs.c?r1=1.80&r2=1.81)
plpgsql.h (r1.116 -> r1.117)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/pl/plpgsql/src/plpgsql.h?r1=1.116&r2=1.117)
scan.l (r1.71 -> r1.72)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/pl/plpgsql/src/scan.l?r1=1.71&r2=1.72)
pgsql/src/test/regress/expected:
plpgsql.out (r1.74 -> r1.75)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/plpgsql.out?r1=1.74&r2=1.75)
pgsql/src/test/regress/sql:
plpgsql.sql (r1.62 -> r1.63)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/plpgsql.sql?r1=1.62&r2=1.63)