Modifying way to check if we have complex diel.
Modifying way to check if we have complex diel.

Checking for complex dielectric in matrixfree.py in  the same
way we did on main.py.

modifying how to initialize MV in matrixfree.py, contmeplating
complex dielectric case.

barbagroup/pygbe,barbagroup/pygbe,barbagroup/pygbe