[conf] add pcre lib to NPS

For some reason this needs to be explicitly specified for Ubuntu 13.04,
while it was working without it on 12.04.
[rotorcraft] add missing include so stabilization_attitude_euler_int can be used standalone
[rotorcraft] settings and rough example for float ahrs/stabilization
[ground_segment] add joystick hat to input2ivy

You can use the Hat<Position>(<hat_name>) function to trigger events,
where <Position> is one of
Centered/Up/Right/Down/Left/RightUp/RightDown/LeftUp/LeftDown

Only one hat can be used, but the interface will allow multiple ones in
the future.
[nps] make radio_control type datalink work
[peripherals] mpu60x0_i2c: only copy ext data if i2c_bypass is false
[imu] fixes for imu_drotek_10dof_v2

- fix copying of unscaled gyro/accel data
- make i2c addresses of mpu and hmc configurable
- change orientation so z-axis is down when chips face up: define IMU_DROTEK_2_ORIENTATION_IC_UP
- silence some warnings
[fix] Yaw command was overwritten by trim.
[fix] logging wrong channels
Merge remote-tracking branch 'paparazzi/v5.0' into uasgroup-v5.0
[subsystems][nav] Updated custom poly_survey_adv for state interface
[conf] Updated uasgroup flightplan and UAP3_A for v5.0
[conf] Added some older uasgroup conf flightplan/airframe files
[energy_ctrl] Minor energy control updates

 * fix typos and update comments
 * clean up MAX_CLIMB defines
 * make MAX_ACCELERATION configurable
[imu] Added another orientation for aspirin2
[conf] Minor updates UAP3 airframe
[conf] Updated UAP3_A and digital cam module rate