Merge branch 'js/fmt-patch' into next

* js/fmt-patch:
  Teach fmt-patch about --keep-subject
  Teach fmt-patch about --numbered
  fmt-patch: implement -o <dir>
  fmt-patch: output file names to stdout
  Teach fmt-patch to write individual files.

diff --cc log-tree.c
Simple merge

diff --cc show-branch.c
Simple merge