Samo&Miha: Poly structure build and debugging.

mihaf

2013-12-03 2bdec5571ad2582dcc492d03148620b1b0c618ce

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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.