Undocumented default seed for PRNG "random"

[Tikrass]

I am not sure whether this is a noteworthy issue, but I had my problems with it. In the compiler module program.py the seed of the default random.Random instance is set to 0:

    def reset_values(self):
        """ Reset register and memory values. """
        for tape in self.tapes:
            tape.reset_registers()
        self.mem_c = range(USER_MEM + TMP_MEM)
        self.mem_s = range(USER_MEM + TMP_MEM)
        random.seed(0)

I assume that this is for reproducible pseudo-randomness during compilation. However, this also affects the PRNG a user might use in his own program.

I suggest to highlight this behavior somewhere in the documentation, or switch to a custom instance of random.Random wherever reproducible pseudo-randomness is required in the compiler.

More about random.Random: https://docs.python.org/2/library/random.html

I did not test this, but I can imagine that resetting the global seed also has some unwanted side effects, if the compiler.py is called from a Python script, for example for automated compilation.