Create a SBTree Bonsai as a copy of SBTree.
SBTreeBonsai: Prevent multiple page locking
Decrease size of  bonsai tree buckets
OSBTreeBonsaiTest: Fix gaussian tests
OSBTreeBonsai: introduce bucket pointers
OSBTreeBonsai: store bucket pointers
OSBTreeBonsai: efficient bucket allocation
OSBTreeBonsai integrated into SBTree based RIDSet