Issue 573: Add implementation for Methods "isWrapperFor()" and "unwrap()" in other JDBC classes.

git-svn-id: http://h2database.googlecode.com/svn/trunk@5840 e6896862-9d19-0410-bfb3-e9fa5d50e656
Issue 572: MySQL compatibility for "order by" in update statements.

git-svn-id: http://h2database.googlecode.com/svn/trunk@5841 e6896862-9d19-0410-bfb3-e9fa5d50e656