Geometry optimizations

I'm creating this pull request to review and discuss first.

Disabled Dlugozs var-len int packing, it could be reactivated if needed (tradeoff: 1% memory gain against 20% performance lost in getClosestEdge).
I guess even with the packing turned off we're still doing the calculations for the delta encoding. This is just for convenience right, since the deltas take up the same number of bits as the absolute coords?