`cells config versions` cluttered by `Update mailer valid config`

I’ve dozens and dozens of versions containing no visible change (empty config --diff), but log-message is Update mailer valid config.
Can this be avoided?

definitely should be… we’ll check that

While at it, I suggest an argument to show all versions instead of limiting to the first 20.

fyi, the first issue (config versions cluttered) is fixed in 2.1