Begun changing over coords to cell-centric

Still need to process the hit detection in the LPS. Which means, the
parameter units have to be checked and possibly changed from
world-centric, to cell-centric.
Implemented cdef method to detectHits in main pyx file
Noon hour work

Trying to get Assign Occupancy to work
Nighttime Work

Further work with cell_sizing.
More Nighttime Work

Implemented cell-sizing parameter that will take into account the sizes
of cells in a system.
prange included

Original commit this evening was 30ms, now it is down to 8.1ms thanks to
prange.
Merge pull request #1 from tdeyle/Implement-Cell-Sizing

Implement cell sizing