A fix in restoring from snapshot when filaments are used

Samo Penic

2016-05-24 301c87b8a0ae31d97adf840d90dd241ffb3328b6

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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.