fix accZ/shake detection when copter upside down. oops.

git-svn-id: https://afrodevices.googlecode.com/svn/trunk/baseflight@432 7c89a4a9-59b9-e629-4cfe-3a2d53b20e61
core.numRCChannels now set by RC drivers to show max inputs available.

git-svn-id: https://afrodevices.googlecode.com/svn/trunk/baseflight@433 7c89a4a9-59b9-e629-4cfe-3a2d53b20e61