wishlist: show list of modified files for non-merge commits too

Hi,

It would be nice if bzr-email would show the list of modified files, like bzr log --verbose does.
Currently emailer.py only does this for _merge_ commits, not for simple commits. I assume this
is caused by the following section:

        if len(self.revision.parent_ids) <= 1:
            # This is not a merge, so we can special case the display of one
            # revision, and not have to encur the show_log overhead.
            lr = log.LogRevision(self.revision, self.revno, 0, None)
            lf.log_revision(lr)
        else:
            # let the show_log code figure out what revisions need to be
            # displayed, as this is a merge
            log.show_log(self.branch,
                         lf,
                         start_revision=rev1,
                         end_revision=rev2,
                         verbose=True
                         )

The else branch passes "Verbose=True" to show_log, but the if branch doesn't do anything similar.