refactoring pios_hcsr04 driver:
   added: pios_hcsr04 task
   added: sonar to sensor task
added sonar to FlyingF3
FlyingF3: reject RC-in CH7 & CH8 if use sonar module
HCSR04 driver: rewrite and correct style
HCSR04 driver:remove STM32F1XX GPIO Enable the peripheral clock 'PIOS_SYS_Init(); make this'
HCSR04 driver:reduce capture channels to one
     FlyingF3:board_hw_defs correct pios_tim_servoport_rcvrport_pins - defined(PIOS_INCLUDE_HCSR04)
Created a first version of a headless gcs, to run global control plugins on a second board inside the quad (the first target being a raspberry pi).
Merge branch 'next' into globalcontrol
updated to reflect new uavobjects.
included required libs
A small demo plugin that prints the roll/pitch/yaw values.
pios_hcsr04: update copyright header
sonaraltitude.xml: Rename sonar Range status
sensors.c:remove  #if defined(PIOS_INCLUDE_HCSR04) check
sensors.c: check if sonar queue is registered and initialise SonarAltitude
changed QApplication to QCoreApplication, to remove gui depepdancies.
code cleanup and binary-file renamed to globalcontrol
Merge branch 'sonar_hcsr04' into next