- added average filter (for last two values) for raw pressure
        - changed some "long" to int32_t and "unsigned long" to uint32_t

- Added APM2 (ATmega32U2) support for using TX and RX status leds to indicate PWM and PPM traffic

<RX><OFF> no pwm input detected
<RX><TOGGLE> speed of toggle indicate how many channels are active
<RX><ON> input lost (failsafe)
<TX><OFF> ppm output not started
<TX><FAST TOGGLE> normal PWM->PPM output or PPM passtrough failsafe
<TX><SLOW TOGGLE> PPM passtrough

ArduCopter - removed #define AUTOMATIC_DECLINATION ENABLED line to ensure users don't try and enable it because it needs a bit more work before it's ready for general use

add mag field strength - status tab "magfield"
modify param getting.
mag calibrate error checking
hazys - capm mod

ACM: Added constraints for invalid climb rates. Robert Lefebvre had a bad sonar and very invalid rates crept into the system.

ACM: Loiter tuning updates, turned up I a bit, a higher I will work better if the system is well tuned.

fix detection of CAPM board

thanks Justin!

revert posible camera issue
fix apc220 units rts issue
fix bluetooth comport issue - re andrew
cleanup startup test

ACM: Got the sign wrong. I'm using the derivative of the error now and not the sensor, so the sign was reversed.

this makes the time constant for compass errors closely match the
timing of the older releases - about 10 seconds for a 1 radian change
in heading

this should fix the massive heading issues that people have been
reporting. Please test!

ACM: Broke out the D term for the PID loop to add custom filtering. The current AC_PID filtering wasn't working for this application and we needed more smoothing. Bad pitch oscillations were being transmitted to the copter.

ACM: The I term in update_nav_wp with the no_nav condition was pulling from the wrong PID loop and was essentially 0 all the time.

ArduCopter - Log.pde - added wrap_360 to compass heading field of ATT message to resolve overflow problem that caused heading to appear as being off by 70 degrees

unfortunately this library was causing avrdude to fail to load the hex
to my APM2. Until we work out why, it's disabled.