px4io: split io_handle_battery() out from io_handle_status()

ready to add vservo and rssi
uORB: added new servorail_status object

used for VSERVO and RSSI on FMUv2
px4io: added monitoring of vservo and vrssi

publish via servorail_status ORB topic
added error_count field to sensor report structures
perf: added perf_event_count() method

this allows drivers to get an event_count from a perf counter
Merge branch 'master' of github.com:PX4/Firmware into status_monitoring
drivers: report error_count in drivers where possible
Merge branch 'master' of github.com:PX4/Firmware into status_monitoring
mkblctrl fix and qgroundcontrol2 startup script for different frametypes
Hotfix: Disable gyro scale calibration to prevent people from wrongly using it
Make param save command tolerant of FS timing
Hotfix: Make voltage scaling for standalone default
Merge branch 'master' of github.com:PX4/Firmware
Quadrotor HILS related RC script has been added
Update 1001_rc_quad.hil

Default gain set
Implement Spektrum DSM pairing in V2

- Bind control for V2
- Relays and accessory power not supported on V2 hardware
Fix backwards ifdef in dsm.c
Finally get the #if right!!!
The parameter system is supposed to have a lock; implement one.
Merge pull request #408 from PX4/#407-param-lock

The parameter system is supposed to have a lock; implement one.