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- some factorizations between PPM sum receiver code & standard receiver code
    - EXPERIMENTAL: integration of direct SBUS receiver thanks to the contribution of Captain IxI & Zaggo
      For this, you must use:
         - a MEGA board
         - the RX1 of the Serial 1 port
         - have a way to invert the input signal.
      more info here: http://www.multiwii.com/forum/viewtopic.php?f=7&t=289
    - EXPERIMENTAL: integration of SPEKTRUM satellite receiver thanks to the contribution of Danal Estes
      For this, you must use:
         - a MEGA board
         - the RX1 of the Serial 1 port
      It could be used also on ProMini board with some restrictions (exclusive GUI or Spektrum use)
      more info here: http://www.rcgroups.com/forums/showthread.php?t=1504116
    - EXPERIMENTAL: integration of direct Serial RX, to command the multi from a Bluetooth+phone Signal for instance.
      thanks to Luis
    - many optimizations to reduce loop cycle
    - GPS main function integration
        The code to connect and recognize a GPS with NMEA sentences is here.
        currently calculated:
          - number of sat
          - distance to home
          - direction to home
	The is currently to control code except a nice working GUI
	=> there is no code behind GPS HOME and GPS HOLD, in progress
    - PIN A0 and A1 instead of PIN D5 & D6 for 6 motors config and promini config
      This mod allow the use of a standard receiver on a pro mini
      (no need to use a PPM sum receiver)
      #define A0_A1_PIN_HEX
    - possibility to use PIN8 or PIN12 as the AUX2 RC input
      it deactivates in this case the POWER PIN (pin 12) or the BUZZER PIN (pin 8)
      #define RCAUXPIN8 or #define RCAUXPIN12
    - thanks to Danal, integration of the Eagle Tree Power Panel LCD for configuration
      it's an I2C LCD that should be very convenient for the ProMini because it doesn't require the unique Serial Port
    - all in one FC:
      QUADRINO_ZOOM board integration
      MINIWII : Jussi's MiniWii Flight Controller
    - sensor boards:
      SIRIUS600       // Sirius Navigator IMU  using the WMP for the gyro
      CITRUSv1_0      // CITRUSv1 from qcrc.ca
      DROTEK_IMU10DOF
    - ATAVRSBIN1 mag direction correction (http://www.multiwii.com/forum/viewtopic.php?f=8&t=506&start=60#p4950)
    - no need to define anymore PROMINI or MEGA in the sketch:
      this information is grabed form the board selection in Arduino IDE
    - LEVEL drift problem:
      the root of this problem was identify (at least partly).
      Several options to try to solve it:
      - adding a #define TRUSTED_ACCZ for those who have huge ACC Z variations when some throttle is applied
        (it's a test you should do before tructing ACCZ)
	//#define TRUSTED_ACCZ  -> ACCZ is not taken into account in calculation for small angles
	#define TRUSTED_ACCZ    -> ACCZ is taken into account in calculation for small angles
      - BMA180 init changes to another mode: should help to filter noisy setups
      - adding a #define STAB_OLD_17 for those who still encounter problem with the stable code,
        as the old 1.7 LEVEL code (less elaborated) doesn't seem to cause drift.
     - some flying wing code upgrade (thanks to the suggestion of Hamburger)
     - ACC added: LSM303DLx_ACC