b4 bugs / future improvements

[Maxime Ripard <maxime@cerno.tech>]

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Hi Konstantin,

Thanks again for b4, it's really great :)

There's a bunch of things I have noticed in the recent weeks:

 - It looks like 87e0e464959c breaks msmtp which doesn't recognize the
   -f option, and will just error out

 - Generally speaking, rebasing a b4 series is a bit troublesome:

   - It's a bit tedious to do. One needs to rebase and then edit the
     cover letter by hand without b4 being involved. I don't think doing
     the rebase interface all over again is reasonable, but maybe we
     could add a subcommand to set a new base?

   - If one sends a version, rebases, and then runs b4 trailers -u, then
     no tag is found for that series. I assume it's because the
     change-id has changed, but maybe for series that differ from the
     last sent version we could also look for the last sent change-id?

And finally, and this is more of a feature request, now that it looks
like we have the list of all the older versions in the cover letter and
their base, could we have a subcommand to start a range-diff between an
older version and its base, and the current base and HEAD?

Thanks!
Maxime

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