directly from a node descriptor. It's a minor optimization for a few use
scenarios. It's also convenient for accessing content of historical file
versions directly.
Another CLT, to list the versions of a store.
git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@4496 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261
