mavproxy: update to latest git

Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>
sixpair: add recipe

I emailed the author about the lack of license. Arch Linux claims GPL,
Gentoo claims Public Domain, the authors website all-rights-reserved.

Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>
python-flask: add 0.10.1

Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>