[WP34s] Regularized incomplete Beta function

[Paul Dale]

Changing the documentation will be the quickest fix here. Reordering the arguments to this function in the code is straightforward but several of the statistical distributions will also have to be updated to match.

I guess the big question is what order should the arguments be in? I don't see any benefit to reordering them any differently from what they are currently but am willing to be convinced otherwise.


- Pauli