Fixing the vesicle 123 and neighbours just for a test

Samo Penic

2019-04-23 13f45e61241e43d709df10228b946ed9870e8ebb

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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.