Java3D 1.6.0-pre10 released

Many thanks to runiter for his patch attempting to fix the null appcontext problem, please test, particularly if
you were using the previous workaround for JCanvas3d, I have optimistically removed the old JCanvas3d workaround, but if this breaks for you, let me know!

http://jogamp.org/deployment/java3d/1.6.0-pre10/

No problem on my side. Thanks for this update