[HP49/50g] ERF, ERF inverse, Q, Q inverse in SysRPL

[Gil]

As many of these functions can be expressed in term of erf, erfc, that accept theorically a complex number as argument, it might be interesting to have an alternative way of computing them (with complex number) in the HP50G, just to compare the results with the ones calculated in my programs.

By the way, what do you find for
inverse_ERFc
(1.93206244519E-475)?

The answer should be almost 33, and not infinity
as ERFc
(33) =1.93206244519E-475).

Other question:
inverse_erf(1E-9) =?

The correct answer should be about
8.86226925455E-10 (by effective integral execution),
and not 8.86622703261E-10 (by UTPN).