pgsql: Add psql \set ON_ERROR_ROLLBACK to allow statements in a

Log Message:
-----------
Add psql \set ON_ERROR_ROLLBACK to allow statements in a transaction to
error without affecting the entire transaction. Valid values are
"on|interactive|off".

Modified Files:
--------------
pgsql/doc/src/sgml/ref:
psql-ref.sgml (r1.134 -> r1.135)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/psql-ref.sgml.diff?r1=1.134&r2=1.135)
pgsql/src/bin/psql:
common.c (r1.96 -> r1.97)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/common.c.diff?r1=1.96&r2=1.97)