Don't try to load procedures for PostgreSQL

git-svn-id: http://h2database.googlecode.com/svn/trunk@5282 e6896862-9d19-0410-bfb3-e9fa5d50e656
MVStore: simpler API

git-svn-id: http://h2database.googlecode.com/svn/trunk@5283 e6896862-9d19-0410-bfb3-e9fa5d50e656