Added spherical harmonics routine.I've got a feeling that some harmonics ar...

Samo Penic

2011-03-19 88f45143117f3ae973be6e3ea5dac8063a7b8ece

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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.