Further refine patch for commenting operator implementation functions.

Instead of manually maintaining the "implementation of XXX operator"
comments in pg_proc.h, delete all those entries and let initdb create
them via a join.  To let initdb figure out which name to use when there
is a conflict, change the comments for deprecated operators to say they
are deprecated --- which seems like a good thing to do anyway.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/908ab80286401bb20a519fa7dc7a837631f20369

Modified Files
--------------
src/bin/initdb/initdb.c                  |   13 +
src/include/catalog/catversion.h         |    2 +-
src/include/catalog/pg_operator.h        |   51 ++-
src/include/catalog/pg_proc.h            |  704 +-----------------------------
src/test/regress/expected/opr_sanity.out |   35 +-
src/test/regress/sql/opr_sanity.sql      |   23 +-
6 files changed, 86 insertions(+), 742 deletions(-)

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