pgsql: Add: > > o Add new version of PQescapeString() that doesn't

Log Message:
-----------
Add:

o Add new version of PQescapeString() that doesn't double backslashes
that are part of a client-only multibyte sequence

Single-quote is not a valid byte in any supported client-only
encoding.

o Add new version of PQescapeString() that doesn't double
backslashes when standard_conforming_strings is true and
non-E strings are used

Modified Files:
--------------
pgsql/doc:
TODO (r1.1798 -> r1.1799)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/TODO.diff?r1=1.1798&r2=1.1799)
pgsql/doc/src/FAQ:
TODO.html (r1.302 -> r1.303)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/FAQ/TODO.html.diff?r1=1.302&r2=1.303)