* Reset internal state canonical length in WorkingTreeIterator when moving
* Simplify size test in PackWriter * Declare critical exposed methods of ObjectToPack final * Declare internal flag accessors of ObjectToPack final * Remove unused method isDeltaAttempted() * Simplify setDoNotDelta() to always set the flag
* Fix stash apply using merge logic
* Fixed instability in some GC tests.
* Enable PlotWalk to show additional refs