DIC Physics: added correlation field to output
DIC physics: peridynamic smoothing of displacement

Solve a local PD problem in regions that the DIC results are bad.
Use the good DIC displacement points as a boundary condition and
solve for the disp of the rest of the cells.
Solver num_blocks: limit to max 500 if user does not specify
changes to physics initialization for create_cell_neighbors

Test whether or not another physics has already created the maps
for the element neighbors. If so throw an error because each physics
has its own interpretation of the maps which are shared between physics.

This awkardness needs to be fixed in future.
DIC Phyiscs: Peridynamic smoothing of displacement

Use peridynamics locally anywhere the solution from the DIC correlation
is bad. The good DIC disp points get xferred to a peridynamics physics
and used as BCs. The rest of the domain is solved for.

Some filtering based on the average of neighbor values also included.