Follow JDBC specification on Procedures MetaData, use P0 as return type of procedure.

git-svn-id: http://h2database.googlecode.com/svn/trunk@5651 e6896862-9d19-0410-bfb3-e9fa5d50e656
fix changelog

git-svn-id: http://h2database.googlecode.com/svn/trunk@5652 e6896862-9d19-0410-bfb3-e9fa5d50e656
Issue 531: IDENTITY ignored for added column

git-svn-id: http://h2database.googlecode.com/svn/trunk@5653 e6896862-9d19-0410-bfb3-e9fa5d50e656