A rust implementation of comparative permutation testing, because python is not that fast
Input example: perm_test.test(amount, group_1, group_2).
Output of type: p_value, [tstats of permutations].
Can also return a single tstat if called with perm_test.calc_tstat(group_1, group_2).
Is able to run multiple test if used with perm_test.multitest(amount, group_1, group_2),
though this feature is not faster than iterating over single tests from within python.
Warning: running lots of tests and/or permutations may take a lot of processing power and time.