Reduced the number of zboxes used by each object.
Reduced the number of zboxes used by each object.

This code is tested for 1x1x1 aligned objects, but not for anything else.
I'm suspicious about its correctness in the general case,
   since I hacked it together fairly quickly.

idupree/Lasercake,Lasercake/Lasercake,elidupree/Lasercake,idupree/Lasercake,idupree/Lasercake,elidupree/Lasercake,elidupree/Lasercake,Lasercake/Lasercake,idupree/Lasercake,idupree/Lasercake,elidupree/Lasercake,idupree/Lasercake,elidupree/Lasercake,elidupree/Lasercake,elidupree/Lasercake,Lasercake/Lasercake,Lasercake/Lasercake,idupree/Lasercake,Lasercake/Lasercake