Moved Ylmi into vertex_ts datastructure, since it is vertex related

Samo Penic

2012-06-07 621830b501728adb038b37281bd23d678a3c053d

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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.