WP 34S and 31S bugs and fixes

[DMaier]

I think this is a bug...

The product (Pi) and sum (Sigma) functions don't behave as described in the IOP in the V3.2 printed manual. Specifically, the IOP indicates that they are both one number functions. However, they also fill the stack with zeroes on return.

From

Code:

[r3723]: trunk / xrom / prodsum.wp34s:
sum_product_okay::    RCL .03
            STO L
            Num 0
            FILL
            RCL .01
            RTN

Perhaps this is just a documentation issue. However, I think most users would expect the stack to be preserved.