read committed, more or less. It was read uncommitted before, and so this
makes me more comfortable. I hope it will also reduce optimistic locking failures
under concurrent load.
git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@4600 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261