Moved all global variables to separate file and defined extern keyword wher...

Samo Penic

2022-05-04 06afc729f9061c1cfa14c78728d61d518324c2f0

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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.