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This example illustrates the use of the option occupations='from_input'.
1) make an LDA self-consistent calculation for an isolated Al atom by
specifying the occupancy of each band in the input file. There are 6
bands (nbnd=6) whose occupancies are:
2.0 0.3333333333333 0.333333333333 0.3333333333333 0.0 0.0
(input=al.in, ouput=al.out)
2) make a sigma-GGA spin-polarized (nspin=2) self-consistent calculation
for an isolated O atom by specifying the occupancies of each band in
each spin channel (for each k-point: only gamma in this example):
1.0 1.0 1.0 1.0 0.0 0.0
1.0 0.33333333333 0.33333333333 0.33333333333 0.0 0.0
(input=O.in, output=O.out)
3) the sama as in point 2), but with the gamma version of the code.
(input=O_gamma.in, output=O_gamma.out)
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