Testing conductivity calculation

The results for the conductivity should be exactly equal for the
main and the getcond routine (which reads in the input of main,
see comp.sh). diff.sh checks for differences. Testing was
successful
Finished testing conductivity

The resulting differences in the results for various number of
slave processes are rooted in the method of parallelization.
The omega integral is split up and the subsums are resummed in
the end by the master process. This leads to numerical inaccuracies
in the last digits and can not be avoided.
Removed testing lines to prepare merge with master
Corrected false update of fermi_indices

Corrected false update of fermi_indices during new grid task.
Also corrected minor error in fermi_indices calculation.