the osgGA::AnimationPathManipulator to handle it.
Added a new Drawable::ConstAttributeFunctor and make the accept(PrimitiveFunctor)
be a const method so can disallows modification. Added Drawable::supports(...) methods
for each of the AttributeFunctor, ConstAttributeFunctor and PrimitiveFunctor so
that programs can querry whether it is possible to use functors with that object type.
Added missing support for reading geometry indices from the .osg format.
Added handling of geometry indices into the primitive functor in osg::Geometry.
Moved the method implementions of AnimationPathManipulator into src/osgGA and added extra convinience
methods for setting the manipulator with an hand built AnimationPath.
FCVS: VisualStudio/osgPlugins/iv/iv.dsp
