Startup: Hex vs Hexa
Merge pull request #639 from PX4/fix_hex_startup

Startup: Hex vs Hexa
Startup: Raise min throttle
Merge pull request #640 from julianoes/mc_min_throttle

Startup: Raise min throttle
Mixer load: don't upload empty mixers from non-existing files
Merge pull request #641 from julianoes/fix_mixer_load

Mixer load: don't upload empty mixers from non-existing files
Merge branch 'beta' of https://github.com/PX4/Firmware into beta_position