Of course, there's not much that this program does yet. It's got
some structure for some sub-commands that don't do anything. And
it has a main command that prints some explanatory text and then
counts all the regular files in your mail archive.
This will (when it is finished) make a much more reliable way to
ensure that notmuch's sync program behaves identically to sup-sync.
It doesn't actually do anything yet.
