Errors in for certain MPI decompositions

[jmahlmann]

For some MPI decompositions, entity errors out with the following issue:

ERROR : dx_min is not the same across all domains: 0.000353 0.000353
ERROR : see the *.err file for more details

This could be a floating point error in the domain decomposition. The above has occurred for this mesh structure:

[simulation]
engine = "srpic"

[simulation.domain]
decomposition = [1,16]

[grid]
resolution = [12288,6144]
extent = [[1.0, 400.0]]

[grid.metric]
metric = "qspherical"