Added support for handling a user define CoordinateFrame in the flight

and trackball manipulators with API access via the MatrixManipulator
base class

src/osgGA/TrackballManipulator.cpp

@@ -230,7 +230,6 @@ void TrackballManipulator::computePosition(const osg::Vec3& eye,const osg::Vec3&
 
 bool TrackballManipulator::calcMovement()
 {
-
     // return if less then two events have been added.
     if (_ga_t0.get()==NULL || _ga_t1.get()==NULL) return false;