pgsql: Per discussion on -hackers, this patch changes psql's "expanded"

Log Message:
-----------
Per discussion on -hackers, this patch changes psql's "expanded" output
mode to only affect the presentation of normal query results, not the
output of psql slash commands. Documentation updated. I also made
some unrelated minor psql cleanup. Per suggestion from Stuart Cooper.

Modified Files:
--------------
pgsql/doc/src/sgml/ref:
psql-ref.sgml (r1.143 -> r1.144)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/psql-ref.sgml.diff?r1=1.143&r2=1.144)
pgsql/src/bin/psql:
command.c (r1.145 -> r1.146)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/command.c.diff?r1=1.145&r2=1.146)
common.c (r1.100 -> r1.101)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/common.c.diff?r1=1.100&r2=1.101)
common.h (r1.43 -> r1.44)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/common.h.diff?r1=1.43&r2=1.44)
print.c (r1.57 -> r1.58)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/print.c.diff?r1=1.57&r2=1.58)
print.h (r1.23 -> r1.24)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/print.h.diff?r1=1.23&r2=1.24)
startup.c (r1.115 -> r1.116)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/startup.c.diff?r1=1.115&r2=1.116)