APM_Control: tweak code layout and param descriptions
build: removed plane 1280 build from autotest

we probably won't support it for the next release.

See http://diydrones.com/forum/topics/keep-supporting-apm1-1280-in-arduplane
Copter WPNav: Leonard's improved speed fix

Also pass in althold gain from main code
Copter: pass alt hold gain to WP_Nav library
Copter: remove unused cli wp report
Copter WPNav: remove unused variable
HAL_AVR: configure analog inputs as INPUT without pullup

not all pins were defaulting to this, which led to some strange
readings on some devices. First noticed by Andi on a LM335 temperature
sensor
HAL_PX4: play some tones on PX4IO firmware load

gives some chance of knowing if it worked
Copter: remove unused NAV_WP_INAV #define
Math: add wrap_PI
Copter Nav: add accessor for waypoint speed
Copter: remove debug message
Copter: circle mode fixes
Autotest: update randy's sim script
AutoTest: add circle mode test
Copter: alt hold feed forward filter
APM_Control: neaten up code formatting
Plane: zero attitude integrators on the ground
APM_Control: cope with zero integrator or tconst

if the user zeros the integrator tuning factor, we need to zero the
integrator
Plane: reset attitude integrators on mode change