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Conflicts:
	src/main/telemetry/hott.c

HoTT check serial data improvement

Disable debug vars by default

Use 4.8 series GCC compiler for Travis build tests

Conflicts:
	.travis.yml

Ideally we want to use 4.8.x but the binary repository does not contain
4.8 any more, only 4.9.x.  The CC3D build will continue to fail until th
code size issue is addressed.

Since 4.9 is known to create broken CC3D and Sparky builds

Add blackbox dataflash support for CC3D

Conflicts:
	src/main/blackbox/blackbox_io.c
	src/main/config/config.c

change every time a new sensor is added.  All the sensor enum values are
now aligned.

Save around 300 bytes of flash by improving Blackbox field name storage

Fix docs for Alien Spider LED configuration

Fixes #544.

Naze target size before: 113412, after: 113388

Closes #551

Also add a bit more Blackbox code documentation 

doesn't use potentially unitialised data to update the motors.  Pause
for 50ms before rebooting after updating disabling the motors to ensure
the timer hardware and ESCs havea chance to react.

This commit might help with #123

Harakiri PID controller fix

Merge branch 'blackbox-flash' of https://github.com/sherlockflight/cleanflight-dev into sherlockflight-blackbox-flash

This is in preparation for backbox on CJMCU/64k.

Flight tested on CJMCU.