Overhaul of C++ part for 64bit compilation and double precision#1

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GPS2288 wants to merge 3 commits intoweinkauf:masterfrom

Commits on Apr 26, 2018

Data types converted to double (from real) and size_t (from int)
GPS2288
committed

Commits on Jan 14, 2020

Data types converted to double (from real) and size_t (from int) in examples and tests
GPS2288
committed
Fixed negative value written into size_t
GPS2288
committed