[supervision] add a simple popup to choose the simtype and launch via the new ppzsim-launch python script
[sim] check targets and ask which simulator to use
[simulators] renamed ppzsim-launch to pprzsim-launch, minor updates to help
[sim] removed launchsitl and replaced it with symlink to pprzsim-launch
[supervision] removed debug print when launching sim
[nps] disable buffering for stdout, so it works nicely in paparazzi center
Merge pull request #354 from flixr/sim_chooser

Sim chooser in paparazzi center