Merge branch 'jc/shortstatus'

Merge branch 'jc/shortstatus'

* jc/shortstatus:
  git commit --dry-run -v: show diff in color when asked
  Documentation/git-commit.txt: describe --dry-run
  wt-status: collect untracked files in a separate "collect" phase
  Make git_status_config() file scope static to builtin-commit.c
  wt-status: move wt_status_colors[] into wt_status structure
  wt-status: move many global settings to wt_status structure
  commit: --dry-run
  status: show worktree status of conflicted paths separately
  wt-status.c: rework the way changes to the index and work tree are summarized
  diff-index: keep the original index intact
  diff-index: report unmerged new entries