[supervision] add a simple popup to choose the simtype and launch via the new ppzsim-launch python script
[build system] removed detection/support for old non-multilib toolchains
* stm32: removed fix-cortex-m3-ldrd from flags: is already enabled with -mcpu=cortex-m3
* lpc21: shoul actually also still work with the really old arm-elf compiler, although not recommended
* While here clean up a bit more and move some more stuff to the common makefile

This fix should fix compilation of stm32 firmwares with other toolchains
then the one provided by paparazzi. Tested with gcc-arm-embedded
(https://launchpad.net/gcc-arm-embedded) 4_7-2012q4 on mac os x and ubuntu 12.04.

The toolchain is more optimized for arm cortex m and r series cpus.
[stm32] removed some more old debug targets in the makefile
[stm32] add -mfix-cortex-m3-ldrd again, seems it is not implied with -mcpu=cortex-m3 despite what the gcc docs say
[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