libsumo: initial commit
cmake: fix qsumo-build on cmake lower than 3.0
warning: fix warning seen with clang-3.4
realtime: send move-packets even if not moving
gitignore: ingore in-source build dirs
ioctl: refactor ioctl_packet sending and ack'ing.
flip: add command to flip the Sumo upside-down
sumo: add flip, balance and longjump

(I haven't seen balance in FreeFlight 3, nice)
qsumo: better turning code
realtime: handle synchronous outgoing heartbeat