Added even more readability in using the trisurf.py's runner class

Samo Penic

2017-01-04 3fc0ef33e7a09a04a9f9055f9085e64255e62299

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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.