Added possibility to skip calculations of spherical harmonics. Fixed docume...

Samo Penic

2014-04-10 632960fbf1ebde72860966058354f7a6b61f5267

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Original written by Dan Kroll in FORTRAN. Code was then largely adapted and commented by Miha Fosnaric-Fosni. Rewritten into C by Samo Penic-Peni, with help of Miha's extensive explanations.