Fix tests for Maxwell with linear medium
Change the tolerances and, if needed, the values of the tests for Maxwell propagation in linear media (tests 03 and 04) since currently they can produce wrong values in some builders and go undetected.
Change the tolerances and, if needed, the values of the tests for Maxwell propagation in linear media (tests 03 and 04) since currently they can produce wrong values in some builders and go undetected.