Improper Integrals on 42 platforms

[lrdheat]

It's an updated 36X Pro, essentially identical, but at least twice as fast, more generous on how many characters can be accepted in a MathPrint mode equation, 3 data lists can handle 50 entries, up from 42 on the 36X Pro. 3 new regressions are available: a*x, a/x + b, a*e^ (b*x). No auto "best choice" as offered by some HP's. Display is easier to read.