* debug-rebuild-ref-tree: Copy HEAD into RefTree
* debug-rebuild-ref-tree: Add --enable flag to turn the database on
* RefTreeDatabase: Allow ORIG_HEAD, etc. on non-bare repositories
* RefTreeDatabase: Expose bootstrap refs in getAdditionalRefs
* Refactor DfsReader selection of cached packs
* Fix duplicate objects in "thin+cached" packs from DFS
* Correct progress monitor on "Getting sizes:" phase
* Search for annotated tag reuse first
* Use long for more object counts in PackWriter
* Do not write edge objects to the pack stream