Added sh_init and sh_free for given datastructure.

Samo Penic

2012-06-07 074a178761daa61a419ef9c2f38f9cd7adc0cdc7

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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.