Bug fixes to partitioning subroutine

Fixed a double-counting of local connections.
Various other bug fixes.

Made outputs to .update, Plot_Coords_EC, and Plot_Parts based on MPI rank.
Moved print of Plot_Coords_EC to FTSim_Parallel.

Still have to figure out where to put call to partitioning.

Still have to try on small 2D mesh.

Still have to try with multiple processors.

Still have to implement sends and receives to neighbors (have sizes and maps, though).