Melchior FRANZ:

Melchior FRANZ:

here is the promised material animation. It looks a bit longish, but that
wasn't avoidable -- there are simply too many parameters to consider. I tried
hard, though, to make the animation fast by only doing the necessary stuff.
It doesn't affect the frame rate here with my test model. The animation is
heavily based on Jim's "material-emission" animation.

* implementation of the "material" animation (this required to make the
  texture path available) + documentation update ($FG_ROOT/Docs/)
* fix some more return values (texture animations, and select) for the
  shadow problem (and some in anticipation of other problems  :-)
* fix compiler warning