The last patch is dropped for now (the automatic --compose stuff)
because I'm not sure which option to add, and that I don't care enough
about it to spend more time on it.
I think I've incorporated most of the stuff people asked about in this
series.
[PATCH 1/4] git send-email: make the message file name more specific.
[PATCH 2/4] git send-email: interpret unknown files as revision lists
[PATCH 3/4] git send-email: add --annotate option
[PATCH 4/4] git send-email: ask less questions when --compose is used.