Added GPLv3 licence file and renames README into README.md. A symbolic link...

Samo Penic

2015-10-06 ac9fa637f834dcd6a83efcfa6e0c5a52f534d5bf

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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.