Merge branch 'master' into mk/rename

Merge branch 'master' into mk/rename

* master:
  git-verify-pack: no need to count errors
  git-verify-pack: buffer overrun paranoia
  git-verify-pack: free pack after use and a cleanup
  git-verify-pack: get rid of while loop
  git-verify-pack: insist on .idx extension
  git-verify-pack: more careful path handling
  git-verify-pack: show usage when no pack was specified
  Add has_extension()
  builtin-apply: remove unused increment
  Fix git-diff A...B
  combine-diff: use color
  git-apply: applying a patch to make a symlink shorter.
  allow diff.renamelimit to be set regardless of -M/-C
  make --find-copies-harder imply -C
  find_unique_abbrev() with len=0 should not abbreviate
  check return value from diff_setup_done()
  Fix tutorial-2.html
  Documentation: git-status takes the same options as git-commit
  Update git-init-db(1) and documentation of core.sharedRepository