* mu4e-compose: allow mu4e-sent-message-behavior to be a function (thanks to egh)
* mu4e: add C-c C-u as an alternative keybinding for mu4e-update-mail-and-index (for terminal users)
* mu4e: update documentation
* fix some confusion between --reindex and --rebuild (remove the former)
* mu4e: unbreak mu4e~compose-setup-fcc-maybe, in particular, 'delete;
* mu4e: add mu4e-compose-dont-reply-to-self, default to nil for now (thanks to sfischme)