Added locking to c? Not used yet, not debugged.

Samo Penic

2016-03-14 fbbc8ee59b12f68bd8575333dbb449eba2b75fd4

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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.