[winswitch] note to downstream packagers - 0.15.2-2

[Antoine Martin]

Hi,

I have added a new wiki page which should be helpful to downstream
packagers, and also for my own use when managing stable updates:
http://xpra.org/trac/wiki/Versions/PendingFixes
From there, you can see what has been applied to each branch, and what
is likely to be applied in future updates.

I mention this now because I managed to make a mess of one patch in
0.15.2, which caused this bug:
http://xpra.org/trac/ticket/900
Because of the way the xpra.org build system works, I was able to push
out fixed packages (as "0.15.2-2") with this change easily enough last
night.
But downstream packagers would have to either snapshot the branch or
convert the commits into patches... At least now it should be more
straightforward.

Cheers
Antoine