Thread: pgsql: Support '' for literal ' in psql single-quote strings,

Log Message:
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Support '' for literal ' in psql single-quote strings, documentation update.

Modified Files:
--------------
    pgsql/doc/src/sgml/ref:
        psql-ref.sgml (r1.162 -> r1.163)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/psql-ref.sgml.diff?r1=1.162&r2=1.163)
    pgsql/src/bin/psql:
        psqlscan.l (r1.18 -> r1.19)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/psqlscan.l.diff?r1=1.18&r2=1.19)