fix ABBA locking problem

git-svn-id: http://h2database.googlecode.com/svn/trunk@5681 e6896862-9d19-0410-bfb3-e9fa5d50e656
add AbbaLockingDetector to test process

git-svn-id: http://h2database.googlecode.com/svn/trunk@5682 e6896862-9d19-0410-bfb3-e9fa5d50e656
fix NPE when backing up and there is a ".mv.db" file lying around that we do not currently have open

git-svn-id: http://h2database.googlecode.com/svn/trunk@5683 e6896862-9d19-0410-bfb3-e9fa5d50e656