Introduced long range perpendicular spin coupling
Introced long range coupling in main routine
Framework for non-local Green's functions in main
Finished parallel RKKY coupling

not yet tested extensively
Cosmetics and new calc-non-local-Ac-Routine
Cosmetic removeal of unnecessary usage of U

in many routine using the the part of the diagonal elements of
the inverse Green's function matrix without epsilon.

All changes should not affect the calculation at all
Implemented nearest neighbor routine
Finished perpendicular coupling
Finished perpendicular coupling
Added calculation of STM spectra

and corrected error in main slave routine (Npp not initialized)
Introduced jpararw and cleaned up
Corrected serious error in calcAcNonLocal

For values near the band edges, the discriminat under the root
which gives ktilde can be negative due to numerical inaccuracies.
Beside the wrong results, the resulting NaN could led a segfault
at a later time.

Updated longrange case in heisenberg.cpp
Added spin relaxation also for the bulk case
Corrected errors in conductivity and used FCC UC