Add pg_opfamily_is_visible.

We already have similar functions for many other object types, including
operator classes, so it seems like we should have this one, too.

Extracted from a larger patch by Josh Kupershmidt

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/b59d2fe4970e689a50e802960ef0812acaf88221

Modified Files
--------------
doc/src/sgml/func.sgml           |    9 +++++++++
src/backend/catalog/namespace.c  |   12 ++++++++++++
src/include/catalog/catversion.h |    2 +-
src/include/catalog/pg_proc.h    |    2 ++
4 files changed, 24 insertions(+), 1 deletions(-)

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