[modules] rewrite cam_control to use gpio instead of led
[modules] gpio_cam_control: fix dox
[gpio] use gpio instead of fake led

power switch as gpio
update board config files
[gpio] use new cam gpio definition
fix POWER_SWITCH_GPIO
[navigation] fix altitude in some extra nav routines

seems this was converted wrongly from the old estimator_z to Enu_f()->z instead of altitude above MSL
in commits 6603e1f0dfc2a48c4fc46ce1f634a3a2046f7367 and 0e9f8ed9476c66704a549ac20491f5fdb75bc616
[modules] update ROTORCRAFT_CAM_SWITCH_GPIO handling
[lpc21] simplifly usb_tunnel, fix LED usage
[modules] photogrammetry_calculator: fixes

The PhotogrammetryCalculatorPolygonSurvey function was not calculating well the angles.

Changed the doc for photogrammetry_sweep_angle variable to be in rad instead of degree.

closes #667
Merge pull request #652 from paparazzi/cam_control_gpio

Use gpio functions instead of abusing fake LEDs.

e.g. for cam_control:
use <define name="DC_SHUTTER_GPIO" value="GPIOC,GPIO12"/> instead of <define name="DC_SHUTTER_LED" value="7"/> with LED_7 being defined somewhere else...
[dox][modules] update dox for servo_cam_ctrl
[dox][modules] slighly improve description for digital_cam
[cleanup] remove outdated/unmaintained vor firmware
[android] beta test of Android GCS app for PPRZ

- server application for the ground station side
- android application:
  http://download.paparazziuav.org/android/PPRZonDroid_v0.4.apk
[ardrone] updated the setpoint gains
Merge branch 'tutorial' of github.com:mavlabTUDelft/paparazzi into tutorial