Unit test functions about libicedb HOT 4 CLOSED

I can code a test suite.
I would do it in python, but that of course would increase the number of dependencies of the overall software suite.
I see the boost library as a testing suite as well, we might prefer this approach to be more consistent

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I have an old boost example, in an old repository. In particular, see globals.cpp, globals.h, test.cpp, test_units.cpp, and test_shapefile.cpp.

It would work rather well, particularly if we continue to depend on Boost.

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I have a sketch of the unit-testing implementation in the hdf-backend-improvements-1 branch. The shape testing can be a part of that.

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Several unit tests were added.

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