Fixed bugs when dump file is missing. Prepared flags for setting filenames

Samo Penic

2014-03-11 3f5c83bc26e98dd41e93fc9023a610cd0ec1d363

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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.