oops. gyro only does NOT need getEstimatedAttitude. bad!
ms5611 driver improvements (was failing below 20c)
merged some althold cleanups

git-svn-id: https://afrodevices.googlecode.com/svn/trunk/baseflight@411 7c89a4a9-59b9-e629-4cfe-3a2d53b20e61