Fixed correct RC loss detection, AR.Drone is now shutting down motors after 1 s of RC loss. Added debug topic.

Checkpoint - this is worth an AR.Drone flight test. Fixed thrust scaling in sensors for manual input, kind of fixed AR.Drone motor interface, very reliable now

Changed a critical section to double precision calculation. It may not be necessary, but lets not risk precision unless we have properly analyzed what numerical precision is required.

Fix typo in roll controller initialization; now roll and pitch controllers respond in a comparable fashion.

Roll/pitch values into the mixer are already scaled appropriately; don't factor them down any further.

git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@5079 7fd9a85b-ad96-42d3-883c-3090e2eb8679

git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@5079 7fd9a85b-ad96-42d3-883c-3090e2eb8679