pgsql-server: Add pg_get_serial_sequence() function, and cause pg_dump

Log Message:
-----------
Add pg_get_serial_sequence() function, and cause pg_dump to use it.
This eliminates the assumption that a serial column's sequence will
have the same name on reload that it was given in the original database.

Christopher Kings-Lynne

Modified Files:
--------------
pgsql-server/doc/src/sgml:
func.sgml (r1.210 -> r1.211)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/doc/src/sgml/func.sgml.diff?r1=1.210&r2=1.211)
pgsql-server/src/backend/utils/adt:
ruleutils.c (r1.173 -> r1.174)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/utils/adt/ruleutils.c.diff?r1=1.173&r2=1.174)
pgsql-server/src/bin/pg_dump:
pg_dump.c (r1.376 -> r1.377)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/bin/pg_dump/pg_dump.c.diff?r1=1.376&r2=1.377)
pgsql-server/src/include/catalog:
catversion.h (r1.239 -> r1.240)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/include/catalog/catversion.h.diff?r1=1.239&r2=1.240)
pg_proc.h (r1.338 -> r1.339)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/include/catalog/pg_proc.h.diff?r1=1.338&r2=1.339)
pgsql-server/src/include/utils:
builtins.h (r1.243 -> r1.244)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/include/utils/builtins.h.diff?r1=1.243&r2=1.244)