C8a : Error functions, their inverses, integrals, including the normal distribution function

S15ABF	Cumulative Normal distribution function $P (x)$
S15ACF	Complement of cumulative Normal distribution function $Q (x)$
S15ADF	Complement of error function $erfc (x)$
S15AEF	Error function $\erf (x)$
S15AGF	Scaled complement of error function, $erfcx (x)$
S15DDF	Scaled complex complement of error function, $\exp (- z^{2}) erfc (- i z)$