pgsql: Honor to_char() "FM" specification in YYY, YY, and Y; it was

Log Message:
-----------
Honor to_char() "FM" specification in YYY, YY, and Y; it was already
honored by YYYY. Also document Oracle "toggle" FM behavior.

Per report from Guy Rouillier

Modified Files:
--------------
pgsql/doc/src/sgml:
func.sgml (r1.502 -> r1.503)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/func.sgml?r1=1.502&r2=1.503)
pgsql/src/backend/utils/adt:
formatting.c (r1.162 -> r1.163)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/formatting.c?r1=1.162&r2=1.163)
pgsql/src/test/regress/expected:
timestamp.out (r1.40 -> r1.41)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/timestamp.out?r1=1.40&r2=1.41)
timestamptz.out (r1.34 -> r1.35)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/timestamptz.out?r1=1.34&r2=1.35)