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This reverts commit 403792fe

This reverts commit ed8d7721

-Now the mixed density matrix is corrected to only include diagonal elements 0<x<1 or 2 depending on the spin
-Maybe this helps to keep the mixing_history better for DFT+U

-They still had the old format of tetraeder output

Adjusted force tests regarding k-points. Split into one for standard forces and one for force levels.

-The test is run after all other tests (also in the split up hdf5 tests on the ci), only the final out.xml is validated (no intermediate stages)
-All Validation Errors are logged

-Also replaced some explicit spin loop sizes with either get_spins or size(qal,3) for jDOS

This is to reduce input.