Acro Flying with CC3D

 All my fpv frames are stuck on ground for now, so this week is LOS time, and acro training.

I had to test this Virtual Flybar mode in OpenPilot. CC3D is loaded with latest Taulabs code, Peabody124 added the missing D term on the Virtual Flybar PID loops, and it changes everything. Now it's far more flyable.
Looks a bit like Multiwii rate mode with high Roll/Pitch rate setting, feels slightly differently, it's hard to explain.