Major Description
right now rename and move operations cannot be identified during
commit processing in validators or commit hooks.
for proper (and backwards compatible) permission evaluation however
we need the ability to distinguish between moving a node around or
having nodes + properties being removed and added.
during the last oakathon michael and myself had a discussion regarding
that issue and michael convinced me that this can't be achieved by simply
passing the move information contained in RootImpl to the commit hook.
therefore creating this issue to track progress and discussions regarding
move and renaming.
