Add get_bit/set_bit functions for bit strings, paralleling those for bytea,

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

Commit: 9507c8a1db14d022296144f391ea4741f4f848ca
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2010-01-25T20:55:32Z
Releases: 9.0.0
Add get_bit/set_bit functions for bit strings, paralleling those for bytea,
and implement OVERLAY() for bit strings and bytea.

In passing also convert text OVERLAY() to a true built-in, instead of
relying on a SQL function.

Leonardo F, reviewed by Kevin Grittner

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