added changelog, deleted authors file

CHANGELOG.md

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+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
+=============
+
+Changes since old_master tag
+
+General
+-------
+
+- 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
+
+New hardware support
+--------------------
+
+- Support for new autopilot boards
+    - [Umarim] (http://paparazzi.enac.fr/wiki/Umarim_v10)
+    - [Umarim Lite] (http://paparazzi.enac.fr/wiki/Umarim_Lite_v2)
+    - [NavGo] (http://paparazzi.enac.fr/wiki/NavGo_v3)
+    - [Lisa/M 2.0] (http://paparazzi.enac.fr/wiki/Lisa/M_v20)
+- IMU Aspirin 2.1 support
+- BlackMagicProbe JTAG support
+
+Airborne
+--------
+
+- 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)
+
+Rotorcraft firmware specific
+----------------------------
+
+- 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)
+
+Fixedwing firmware specific
+---------------------------
+
+- Using a gyro (with IR sensors) is done via imu subsystem now as well
+
+Simulator
+---------
+
+- JSBSim interface updated for new FGAccelerations class
+- FlightGear interface defaults to version 2.6, define FG_2_4 for 2.4
+- NPS simulator [#205] (https://github.com/paparazzi/paparazzi/pull/205)
+    - has it's own nps target (instead of sim)
+    - fdm type renamed from nps to jsbsim
+    - waypoint altitude fixed
+    - Improved ground interaction for JSBSim, can now initialize on ground
+      [#222] (https://github.com/paparazzi/paparazzi/pull/222)
+    - Radio control via joystick now uses SDL (so works on OSX as well)
+      [#232] (https://github.com/paparazzi/paparazzi/pull/232)
+
+
+STM32 architecture
+------------------
+
+- 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"/>```