Rename the C functions bitand(), bitor() to bit_and(), bit_or().

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 84fc571395f6986d912cda6c09826cb10caee7f0
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2010-12-27T19:57:41Z
Releases: 9.1.0
Rename the C functions bitand(), bitor() to bit_and(), bit_or().

This is to avoid use of the C++ keywords "bitand" and "bitor" in
the header file utils/varbit.h.  Note the functions' SQL-level
names are not changed, only their C-level names.

In passing, make some comments in varbit.c conform to project-standard
layout.

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