pgsql: Rename the recently-added pg_timezonenames view to

Log Message:
-----------
Rename the recently-added pg_timezonenames view to pg_timezone_abbrevs,
and create a new view pg_timezone_names that provides information about
the zones known in the 'zic' database. Magnus Hagander, with some
additional work by Tom Lane.

Modified Files:
--------------
pgsql/doc/src/sgml:
catalogs.sgml (r2.131 -> r2.132)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/catalogs.sgml.diff?r1=2.131&r2=2.132)
pgsql/src/backend/catalog:
system_views.sql (r1.30 -> r1.31)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/system_views.sql.diff?r1=1.30&r2=1.31)
pgsql/src/backend/utils/adt:
datetime.c (r1.170 -> r1.171)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/datetime.c.diff?r1=1.170&r2=1.171)
pgsql/src/include/catalog:
catversion.h (r1.356 -> r1.357)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/catversion.h.diff?r1=1.356&r2=1.357)
pg_proc.h (r1.424 -> r1.425)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/pg_proc.h.diff?r1=1.424&r2=1.425)
pgsql/src/include:
pgtime.h (r1.12 -> r1.13)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/pgtime.h.diff?r1=1.12&r2=1.13)
pgsql/src/include/utils:
datetime.h (r1.60 -> r1.61)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/utils/datetime.h.diff?r1=1.60&r2=1.61)
pgsql/src/test/regress/expected:
rules.out (r1.118 -> r1.119)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/rules.out.diff?r1=1.118&r2=1.119)
pgsql/src/timezone:
pgtz.c (r1.44 -> r1.45)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/timezone/pgtz.c.diff?r1=1.44&r2=1.45)