[conf.xml][GUI] GUI for selecting the desired active list of airframes.
[conf.xml] update configure gui

replace os.systems calls with generic remove and copy commands that work on multiple platforms.
The os.symlink still only works on posix systems of course.
[conf.xml] configure gui improvements

- sort list
- use python tools to get info about current conf, i.e. link to which file
[conf.xml] gui: exclude backups from list
[conf.xml] gui improvements

- non-editable combo box
- set current conf as active selection
- only ignore conf.xml if it's already a symlink
[conf.xml] gui: checkbox for showing backups
[nps] simple wind simulation

No vertical wind component for now, only magnitude and direction.
Also no gusts so far...
Can be changed via settings.

Towards solving issue #540
[nps] ability to set gps outage via settings
[stm32][actuators_pwm] add defines for TIM9 and TIM12
[conf] rename configre.py to select_conf.py

some other minor improvements
[conf] rename from *.xml.example to *_example.xml

- select_conf: personal conf file is conf_personal.xml
[tools] calibration: improve bounding box in mag plot
[nps] add turbulence
Merge pull request #536 from paparazzi/configure

[conf.xml][GUI] GUI for selecting the desired active list of airframes.
[conf] aspirin_v2.2: don't set USE_SPI_SLAVE1 by default

since most lpc based boards only have one SlaveSelct line (e.g. tiny,twog,yapa, ...)
[lib] fix default maps file in maps support
[maps] update_google_version: only one try and 10s timeout
[imu] add LISA_S_UPSIDE_DOWN hack
[rotorcraft] FAILSAFE mode: neutral attitude, downward vel even if FAILSAFE_GROUND_DETECT not used
[gcs] on flight plan save: correct dtd for subdirs

not nice, but works...