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Otherwise states get one of 2^64 different values in the initial partition,
meaning that they will be distinguished already.

This switches from floats to a sort of arbitrary precision base10 floating point
implementation where we can easily generate uniform random numbers.

The problem with floats is that they aren't distributed equally across the whole
range and thus a random number in [0, 1) is not uniform.

This was also renamed accordingly in CoPaR itself

Hides ugly debug output from stderr but instead persists it in the generated
file, in case someone wants to re-generate it (e.g. after fixing a bug in the
generator).