MVStore

git-svn-id: http://h2database.googlecode.com/svn/trunk@5055 e6896862-9d19-0410-bfb3-e9fa5d50e656
A checkpoint is now done every MAX_LOG_SIZE / 2 instead of every MAX_LOG_SIZE, so that the transaction log doesn't grow as large.

git-svn-id: http://h2database.googlecode.com/svn/trunk@5056 e6896862-9d19-0410-bfb3-e9fa5d50e656