Polymers thermicaly move now! HArmonic potential added.

Miha

2014-02-06 fedf2b217113800a15f367e111e2dbcad4a3c92c

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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.