Distorted Android

1. new package 'message'
2. Rename the 'Grid' classes to match

move data types, like FlatND and InterpolatorND, to a separate package.

comment cleanup in DistortedObject.

cleanup in DistortedObject's methods.

Add license

remove the remains of DistortedBitmaps from DistortedNode

Bugfix for removeByType

Save PNG effect almost finished. Supporting App (hopefully!) completely finished.

What remains to be done: put actual saving of the Bitmap in a separate thread, away from the Graphics thread!!

Javadoc stuff.

Implement SAVE_PNG