nspin=2 not functional

[meisenbach]

The spin polarized case (nspin=2) is not yet functional.
Non polarized and non-collinear work fine. (nspin=1 and nspin=3)
One atom Cu test case: (last line of k.out)

nspin=1
27 -3304.864274815518 0.598479 0.000000 0.0000000000

nspin=2
43 -3259.538115852943 2.896768 11.000000 0.0000000000

nspin=3
27 -3304.864274815286 0.598479 0.000000 0.0000000000

[meisenbach]

Cu test case seems to work for nspin=1,2,3.
Fe for nspin=2 still gives wrong result:

see k.out:

nspin=2
3 212032.839902905107 -535.176085 0.000000 3.6296265420

nspin=3
3 -5082.168875113460 0.695406 2.377591 0.0000937928

[meisenbach]

after August 2 fix:

nspin=2:
3 -5082.064139956775 0.716173 2.430205 0.0011603505

reasonable result, but the discrepancy between nspin=2 and nspin=3 is still too large.