Bug in BINOMIAL_ICDF

[lrdheat]

Hi Dieter,

The WP 34S also has the same problem with large "n".

It returns a binomial CDF of less than .5 for n=100,000,000
K=50,000,000
P=.5

Returns ~.4887

For n=1EEX9, k successes=5EEX8, p of individual success=.5, the binomial CDF wanders all the way down to ~.1815.

For this reason, I feel that n>~1EEX7 should not be accepted in the WP 34S , the CASIO 9860gii, and on the Prime.