Give permutation utilities a size type

[DanecLacey]

Right now, all perm related things are int, which is suitable for most cases. Eventually, one should include a templated size type parameter for consistency.

[9VZZH7]

However, as long as A_n_rows is int, perm can be int as well.
Should both A_n_rows and perm be updated to a template?
Should it be one different from IT?

[DanecLacey]

However, as long as A_n_rows is int, perm can be int as well. Should both A_n_rows and perm be updated to a template? Should it be one different from IT?

@9VZZH7 As long as the number of rows doesn't exceed the int datatype, I believe everything is fine. I was moreso thinking for uniformity in the utilities, just to have everything tempated. But it's not an issue, just something to get to when there is time.