Removed double negation for coordinates, world aligned orientation -> camera
orientation, removed roll.
Add pitch/yaw scale preference to control degree of view rotation.
Think this needs to be a double.
OK, one more try.
One more "one more try."
We need to sync in order to ensure that the settings are saved.
Merge pull request #502 from ey6es/gyroquat

Increase YAW_DECAY, remove roll from head camera, provide option for pitch/yaw scale (zero by default).