Added some basic help on flags. Unformatted.

Samo Penic

2016-05-27 ba73ab71fa4df14cbf55bf4111c791eea21a85c8

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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.