Function: elltatepairing
Section: elliptic_curves
C-Name: elltatepairing
Prototype: GGGG
Help: elltatepairing(E, P, Q, m): computes the Tate pairing of the two points
 P and Q on the elliptic curve E. The point P must be of m-torsion.
Doc: Computes the Tate pairing of the two points $P$ and $Q$ on the elliptic
 curve $E$. The point $P$ must be of $m$-torsion.
