Tweak thread sorting in Gnus

AFAICT, by default Gnus threads by *root article* number, oldest
above, newest below.

I'd like to keep the "newest below" logic (messages are sorted within
a thread anyhow), while making sure threads updated recently show
up *below* older threads.

Hence:

- put gnus-thread-sort-by-number first to break ties, following the
  recommendation from (gnus) Sorting the Summary Buffer,

- invert gnus-thread-sort-by-most-recent-number, to have
  recently-updated threads below older threads.

Not sure this implements exactly what I want (I think I saw some
surprising results here and there), but it seems to come close.

Also note down more useful key bindings.

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