I got full-on git-annex assistant syncing going over XMPP today!

How well does it work? Well, I'm at the cabin behind a dialup modem. I have
two repos that can only communicate over XMPP. One uses my own XMPP server,
and the other uses a Google Talk account. I make a file in one repo, and
switch windows to the other, and type `ls`, and the file (not its content
tho..) has often already shown up. So, it's about as fast as syncing over
ssh, although YMMV.

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Refactored the git push over XMPP code rather severely. It's quite a
lot cleaner now.

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Set XMPP presence priority to a negative value, which will hopefully
prevent git-annex clients that share a XMPP account with other clients from
intercepting chat messages. Had to change my XMPP protocol some to deal
with this.

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Some webapp UI work. When showing the buddy list, indicate which buddies
are already paired with. 

After XMPP pairing, it now encourages setting up a shared cloud repository.

[[!img /assistant/xmpppairingend.png]]

I still need to do more with the UI after XMPP pairing, to help the paired
users configure a shared cloud transfer remote. Perhaps the thing to do is
for the ConfigMonitor to notice when a git push adds a new remote,
and pop up an alert suggesting the user enable it. Then one user
can create the repository, and the other one enable it.