Distorted Android

Split the DistortedNode class into two - DistortedNode and DistortedNodeData

Some simplifications to the Node.

Fixes for memory leak problems uncovered by the 'Rubik' app. (mainly: new method DistortedNode.markForDeletion)

We don't have to mark Textures for creation until we fill them up with data.

Correct the same bug for DistortedTextures and DistortedFramebuffers: only mark them for creation when we actually have everything ready, i.e. as the last statement in the constructor.

Correct a bug in DistortedBuffer: we only mark it for creation when we actually have all the data ready, otherwise it can happen that create(0 is called before setData() !

Improve locking in DistortedObject.
DistortedMaster: slaves can be NULL !

Many things.

1) make the Dynamic.setDuration() able to be called AFTER the Dynamic has already been run. (and rename it to 'makeRunNowFor()' )
2) remove the automatic removal of zero Effects from EffectQueues.
3) adjust several Apps to cope with 2)
4) add post-rotation to Rubik (still not finished)

Add correct normal vectors to the PINCH effect. The effect is now fully 3D.

Make the 'PINCH' effect fully 3D (define its acting line in terms of (latitude,longitude) angle pair).

Still, something is not fully working in the Earth app with the effect - investigate.