Merge branch 'maint'

Merge branch 'maint'

* maint:
  test: checkout shouldn't say that HEAD has moved if it didn't
  completion: enhance "current branch" display
  completion: simplify "current branch" in __git_ps1()
  completion: fix PS1 display during a merge on detached HEAD
  builtin-checkout: Don't tell user that HEAD has moved before it has
  pre-commit.sample: don't print incidental SHA1
  tests: Add tests for missing format-patch long options
  api-parse-options.txt: use 'func' instead of 'funct'
  Turn on USE_ST_TIMESPEC for OpenBSD
  ls-tree manpage: output of ls-tree is compatible with update-index
  ls-tree manpage: use "unless" instead of "when ... is not"