renamed *JSON apis to *Json
Merge branch 'rename_JSON_Json'
added policy oriented apis
Merge branch 'add_policy_apis'
added opData
Merge branch 'op_tracking'
added node.parent; removed opData.*Parent
renamed mergeOp -> merge & doMerge -> mergeNode
three things: rearranged prototype, renamed some methods, store hdl deprecation
removed newHdl from callback for BpTree#store()
removed BpTree#storeLeaf as redundent
Node#size() measures size of keys instead of children; and the code affected
removed near identical code btw removeFromLeaf & removeFromBranch
tweaked .storeNode() and .store()
Merge branch 'redo_api'