Use eigen cast to convert from 3D coordinates to integer grid coordinates
Add new method to unroll the loop with a 3D offset as input
Add new method to collect a grid and its neighborhing cells according to the epsilon value used at construction time
Now extract the exact congruent set by getting the neighbhoring cells in the uniform grid containing the quad invariants
Remove hack used to reduce side effects due to the partial congruent set extraction
Compute LCP at the beginning
Fix demo script parameters: reducing overlap (over-estimated)