Log Message:-----------Replace PLpgSQL_dstring by StringInfo.
Replace redundant PLpgSQL_dstring functionality with StringInfo.Patch by Pavel Stehule. Review by Joe Conway.
Modified Files:-------------- pgsql/src/pl/plpgsql/src: gram.y (r1.126 -> r1.127) (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/pl/plpgsql/src/gram.y?r1=1.126&r2=1.127) pl_exec.c (r1.245 -> r1.246) (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/pl/plpgsql/src/pl_exec.c?r1=1.245&r2=1.246) pl_funcs.c (r1.79 -> r1.80) (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/pl/plpgsql/src/pl_funcs.c?r1=1.79&r2=1.80) plpgsql.h (r1.113 -> r1.114) (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/pl/plpgsql/src/plpgsql.h?r1=1.113&r2=1.114)