[bzr-email:MERGE] special case logging a single non-merge revision

[John Arbash Meinel]

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Now that we've been tuning stuff like 'bzr commit' for performance, I'm noticing
that a good portion of the time spent in every commit is in 'bzr-email'. I broke
it down into something like:

~  1.25s smtplib.starttls()
~  1.02s smtplib.connect()
~  2.00s show_log()

There isn't a lot I can do about the time it takes to connect and start a tls
connection. I did notice that it is a bit faster if I connect directly to the
mail server, rather than going through an ssh tunnel. (of course, if I was going
through an ssh tunnel, I wouldn't need starttls, but ...)

Anyway, this patch just special cases when there is a single revision to be
displayed (no merges). We know we don't have dotted revnos, we already know the
revno, etc.

The patch is pretty small, and it cuts of 2 seconds during 'bzr commit'.
Originally, I thought we could do the special casing in 'show_log', but that
adds a lot of complexity for a rare use case. (It is quite common for bzr-email,
but not for 'bzr log'.)

John
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