Added automated python script system-wide installation in build.sh

Samo Penic

2016-05-24 f4a437c36aa53b701466328cba05ac4a34151b63

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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.