Compression except of trisurf header is done. Preparing for decompression

Samo Penic

2019-10-19 4ca00dc38c72f67dc714fbb45b3006afec097c9c

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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.