[rotorcraft] switching to MODE_MANUAL allowed even during HOME_MODE
[rotorcraft] error if MODE_MANUAL == AP_MODE_NAV
[blackmagic] crc break uploading to blackmagic. own stm_mem fixes.
[nav_airspeed] tune navigation airspeeds for diffent phases of the flightplan
[nav_airspeed] Descriptions
[dox] stylec: limit to 100 chars
[conf] remove NPS_JSBSIM_INIT from all example airframes

most people want it to start at flightplan location anyway...
If someone wants to explicitly set the initial conditions, they can add whatever xml file they want...
Merge pull request #1036 from paparazzi/mode_manual_allowed_even_during_home

always allow switching to MODE_MANUAL via RC (even during HOME or FAILSAFE)
Merge pull request #877 from paparazzi/airspeed_tuning

[nav_airspeed] tune navigation airspeeds for diffent phases of the FP
fix_code_style limits to 120 chars instead of 100

it would still be good to limit code line length to 100 when writing the code,
but setting this to something larger avoids stupid automatic wrappings that make things less readable...
[airborne] fix code style on (nearly) all files

```
find sw/airborne/ -regextype posix-extended -regex 'sw/airborne/.*(chibios-libopencm3|lpcusb|efsl|lpc21/include|lpc21/test/bootloader|subsystems/ahrs)' -prune -o -name '*.[ch]' -exec ./fix_code_style.sh {} +
```

ignored ahrs (for now) to not create unnecessary conflicts for some pending changes..