Log Message:
-----------
Fix SHOW and RESET grammar to accept custom variable names.
Modified Files:
--------------
pgsql/src/backend/parser:
gram.y (r2.508 -> r2.509)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/gram.y.diff?r1=2.508&r2=2.509)