Test MPI communication and partitioning of mesh for nonlocal interaction.

Domain and the corresponding mesh:

Domain	Mesh

For the nonlocal length scale horizon = 4h, h being the mesh size, Metis partitioning using two available methods (recursive and k-way) with number of partitions 4 and 8 are as follows:

For the nonlocal length scale horizon = 8h, h being the mesh size, Metis partitioning using two available methods (recursive and k-way) with number of partitions 4 and 8 are as follows: