* Expose disposeBody() on RevCommit and RevTag
* ObjectReader: remove the walkAdvice API
* RevWalk: Discard uninteresting commits unless RevSort.BOUNDARY
* ObjectWalk: make setRetainBody(false) the default
* Always attempt delta compression when reuseDeltas is false
* Avoid TemporaryBuffer.Heap on very small deltas
* Correct distribution of allowed delta size along chain length
* Split remaining delta work on path boundaries
* Replace DeltaWindow array with circularly linked list
* Micro-optimize copy instructions in DeltaEncoder
* Micro-optimize DeltaWindow primary loop
* Micro-optimize DeltaWindow maxMemory test to be != 0
* Mark DeltaWindowEntry methods final