changed simple_hills; it's now faster
changed simple_hills; it's now faster

but it's less mathematically accurate:
   there are hill blocks, and an ideal mathematician could
   find their borders given the landscape.

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