Stop The Presses!

[TribulationStaff]

I just went to use this, and to my horror, graal returned an error when i hit the test button. Stefan P L E A S E put in a greatest common divisor function into gscript. For those of you who don't know, here are some examples:

gcd(1,500)=1
gcd(12,21)=3
gcd(11,101)=1
gcd(4,16)=4