File locking into .lock seems to work fine

Samo Penic

2016-03-15 6e42ef0edaba59fd344e89ffd469202ff2bd39ac

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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.