In calculating the Weil Pairing of two points I get a pari division by
zero error. Needless to say this shouldn't happen. I think that the
solution is that if either of the miller_functions that are calculated
yield a 0 then the value of the Weil Pairing must be 1.
Here's some code that provokes the error
p=100019
E = EllipticCurve(j=GF(p)(1728))
M = (p+1)//3
# find an element of order 3
while True:
P = M*E.random_element()
if P != 0:
break
P.weil_pairing(2*P,3)
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