Added additional functions to ease Ulm2 poststating

Samo Penic

2019-08-14 aede7e0121a037fd7226a8bfd558eb21a932fa5a

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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.