Added vertex move in a sphere with radius stepsize (not cube as before).

Miha

2012-07-13 ed31fe06aaefdb17052ad74cedd561c38d956621

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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.