Compare DOS for integrals, not means
Updates test_dos_magnitude
which compares Si DOS from VASP, FHIaims and exciting to use the integral over the occupied valence states rather than the mean.
The result is a unanimous answer of 8 electrons, with deviations of up to 0.05 electron charge, instead of unintelligible values into the 1e46, where the order of deviation is much larger.
Closes #1201 (closed)