pgsql: Extend the pg_locks system view so that it can fully display all

Log Message:
-----------
Extend the pg_locks system view so that it can fully display all lock
types, as per recent discussion.

Modified Files:
--------------
pgsql/contrib/userlock:
user_locks.c (r1.15 -> r1.16)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/userlock/user_locks.c.diff?r1=1.15&r2=1.16)
pgsql/doc/src/sgml:
catalogs.sgml (r2.101 -> r2.102)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/catalogs.sgml.diff?r1=2.101&r2=2.102)
pgsql/src/backend/catalog:
system_views.sql (r1.12 -> r1.13)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/system_views.sql.diff?r1=1.12&r2=1.13)
pgsql/src/backend/utils/adt:
lockfuncs.c (r1.17 -> r1.18)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/lockfuncs.c.diff?r1=1.17&r2=1.18)
pgsql/src/include/catalog:
catversion.h (r1.267 -> r1.268)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/catversion.h.diff?r1=1.267&r2=1.268)
pg_proc.h (r1.361 -> r1.362)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/pg_proc.h.diff?r1=1.361&r2=1.362)
pgsql/src/test/regress/expected:
rules.out (r1.99 -> r1.100)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/rules.out.diff?r1=1.99&r2=1.100)