Restoration of vertex neighbors completed.

Samo Penic

2016-02-24 487968538b6902a8c102531f5ee60db1c757c219

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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.