Merge branch 'maint'

* maint:
  Prepare 1.7.0.1 release notes
  Fix use of mutex in threaded grep
  dwim_ref: fix dangling symref warning
  stash pop: remove 'apply' options during 'drop' invocation
  diff: make sure --output=/bad/path is caught
  Remove hyphen from "git-command" in two error messages

diff --cc builtin-grep.c
Simple merge

diff --cc git.c
Simple merge