MVStore: maintain separate child count field (might be removed later on)

git-svn-id: http://h2database.googlecode.com/svn/trunk@5239 e6896862-9d19-0410-bfb3-e9fa5d50e656
Fix test cases

git-svn-id: http://h2database.googlecode.com/svn/trunk@5240 e6896862-9d19-0410-bfb3-e9fa5d50e656
Fix performance regression for: Fix bug with ALLOW_LITERALS=NONE, where the periodic analyze table on insert would throw an exception.

git-svn-id: http://h2database.googlecode.com/svn/trunk@5241 e6896862-9d19-0410-bfb3-e9fa5d50e656
Test MVTableEngine again

git-svn-id: http://h2database.googlecode.com/svn/trunk@5242 e6896862-9d19-0410-bfb3-e9fa5d50e656