NULL specification, indexes, permissions, etc on table

* Add SIMILAR TO to allow character classes, 'pg_[a-c]%'

* Auto-destroy sequence on DROP of table with SERIAL(Ryan)

* Allow LOCK TABLE tab1, tab2, tab3 so all tables locked in unison

* Allow LOCK TABLE tab1, tab2, tab3 so all tables locked in unison [lock]

* Allow INSERT/UPDATE of system-generated oid value for a row

* Allow ESCAPE '\' at the end of LIKE for ANSI compliance [like]

* Rewrite the LIKE handling by rewriting the user string with the