lib:
- handle checkout of trees which contain submodules by identifying and
ignoring such tree entries; requires a .ini config parser (from isakmpd?)
tog:
- allow loading new commits in 'tog log' after startup (e.g. via Ctrl-L, 'r')
- make diff view generate diffs in a background thread?
- implement horizonal scrolling in all views
- implement horizonal split view mode
- implement search feature
- allow moving to prev/next blamed line in diff view if opened from blame view,
similar to how the diff view can switch commits if opened from log view
