Random permutation to generate null distribution #84
Description
RDP5 provides the option of generating random permutations of the user's input alignment to remove any signal of recombination. Applying recombination tests to the resulting permutations should approximate a null distribution of test statistics, which can be used to assess significance of tests on the original alignment. Note this will scale linearly with the number of permutations requested - on the other hand it should be trivial to parallelize.