TODO

TODO LIST
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- use OpenMP to parallelize some parts of the code, like the loops for neighbor search, for computing the Nye tensor, for constructing Voronoi polycrystals, or for converting files in mode "--list". The code should auto-detect the number of cores on the user's machine, and by default use as many threads. A command-line parameter should allow the user to specify the max. number of threads to use (e.g. "-threads N").