Random Forest generator Demo

[Andrea V. <and...@gm...>]

Ok,

Just a little demo:

http://andrea.viarengo.googlepages.com/forest.pipmak

I think it should be suitable for the showcase, because it demostrate
some Advanced Pipmak features, like 3D patches. 

-Andrea

P.S.: there also demostrate a possible use of pipmak.displaytext()