Merge branches 'jc/rev-list' and 'jc/pack-thin' into next

* jc/rev-list:
  rev-list --objects: use full pathname to help hashing.

* jc/pack-thin:
  pack-objects: hash basename and direname a bit differently.
  pack-objects: allow "thin" packs to exceed depth limits
  pack-objects: use full pathname to help hashing with "thin" pack.