tweaked bug fix so MoveLeafNode() will copy any flag from source node
Merge branch 'voron' of https://github.com/ayende/raven.voron into batch_reads

Conflicts:
	Voron/Trees/TreeRebalancer.cs
work in progress --> immutable trees
Moving to immutable trees, all trees handling can now be done only through tx.
Cloned the values so we won't have aliasing issues.