refs:
? detect branches from remote origin?
  (no need to pull local branches for non-bare repos).

performance:
- optimize git_diff_get_stats.
- speed up generating files.

cleanup:
- simplify writebranches and writetags, just use git_reference_*,
  it should kill some lines.

layout:
- make top menu look nicer in links/lynx again.
? show tags in log.

documentation:
- improve mandoc pages.