Don't store totals in notes
Enable note rewriting in setup

Prevents losing track of worktime when rebasing.
It work in a way such that new records are written before the old ones,
causing little mess, but such is life.

Might consider writing a post-rewrite hook for sorting, or sort when
displaying (won't work with git log --notes=worktime).

To use this, you need to `git work setup` on all your repos again.
Use `git log --format=%H` instead of `rev-list`

This gives greater flexibility in specifying range of commits in `total`
(for example, one can use --since).