[pymtl] fixed bug in .next update, only gcd fails!
[pymtl] fixed bug in .next update, only gcd fails!

tj93/pymtl,Glyfina-Fernando/pymtl,jck/pymtl,jjffryan/pymtl,cornell-brg/pymtl,Glyfina-Fernando/pymtl,cornell-brg/pymtl,12yujim/pymtl,Abhinav117/pymtl,12yujim/pymtl,Abhinav117/pymtl,jjffryan/pymtl,cfelton/pymtl,cfelton/pymtl,cornell-brg/pymtl,Abhinav117/pymtl,cfelton/pymtl,Abhinav117/pymtl,jjffryan/pymtl,jck/pymtl,tj93/pymtl,tj93/pymtl,12yujim/pymtl,Glyfina-Fernando/pymtl,jck/pymtl