Paparazzi 4.1 - development branch

STM libs completely replaced by libopencm3
Input2ivy uses SDL for joysticks (cross-platform, works on OSX as well now) [#220] (https://github.com/paparazzi/paparazzi/pull/220)
Option to change text papget color using a combobox [#194] (https://github.com/paparazzi/paparazzi/pull/194)

Paparazzi 4.0.1

Maintenance release

Serious fix for settings:
- Handler was not called if module was not specfied as well. Now an error is generated with info on which file to fix.
- Settings for adaptive fw stabilization fixed.
Fixes for photogrammetry module.
Fixes for digital_cam modules.
Tool added: mergelogs

Changes since old_master tag

Settings for the telemetry modes are automatically generated from the XML file [#118] (https://github.com/paparazzi/paparazzi/pull/118)
Documentation node for modules [#182] (https://github.com/paparazzi/paparazzi/pull/182)
Automatic conversion of units in airframe file, settings and messages. See http://paparazzi.enac.fr/wiki/Units
Fix rc_settings: this enables you to change some settings in flight directly from the RC, is useful if you are alone or don't have a GCS.
Prefer compiler found in PATH over /opt/paparazzi/arm-multilib [#231] (https://github.com/paparazzi/paparazzi/issues/231)
Usability improvements for calibration scripts and added 3D view of magnetometer data with fitted ellipsoid

All control gains are now positive [#127] (https://github.com/paparazzi/paparazzi/pull/127)
RC input follows sign conventions [#124] (https://github.com/paparazzi/paparazzi/issues/124)
A modification of the transport layer (pprz and xbee) in order to allow to select the device at the message level.
New modules:
- xtend_rssi [#88] (https://github.com/paparazzi/paparazzi/pull/88)
- open_log [#82] (https://github.com/paparazzi/paparazzi/pull/82)
Subsystem for new ahrs estimation algorithms: float_cmpl_rmat
Improvements for AHRS int_cmpl_quat and float_cmpl_rmat
- Correction of centrifugal acceleration
- Proper handling of BODY_TO_IMU rotations
All status LEDs configurable (with sensible defaults for the boards): SYS_TIME_LED, AHRS_ALIGNER_LED, BARO_LED, GPS_LED, RADIO_CONTROL_LED
Possibility to use two 2-way switches for the mode instead of one 3-way switch
GPS NMEA parser usable for basic position and fix [#120] (https://github.com/paparazzi/paparazzi/issues/120)

Stabilization/supervision commands with standard PPRZ range [#169] (https://github.com/paparazzi/paparazzi/pull/169)
Additional motor arming options [#174] (https://github.com/paparazzi/paparazzi/pull/174)
Replaced INV_M with NOMINAL_HOVER_THROTTLE (in %) To use a fixed value instead of the adaptive vertical filter [#177] (https://github.com/paparazzi/paparazzi/pull/177)
Some fixes when changing vertical guidance modes
Same behaviour (gains) for AP_MODE_HOVER and NAV when holding position [#82] (https://github.com/paparazzi/paparazzi/pull/82)

Luftboot USB bootloader
Updated ADC defines for lisa/m You should now be able to use ADC_1, ADC_2, ADC_3 for the ADCs on the ANALOG1 [#159] (https://github.com/paparazzi/paparazzi/issues/159)
Enable second spektrum receiver via <configure name="USE_SECONDARY_SPEKTRUM_RECEIVER" value="1"/>
Enable new I2C driver via <configure name="USE_NEW_I2C_DRIVER"/>