Test of integration using PyOpenCL.

First is a simple reduce to compute one simple integral. Then there is a
kernel performing integration on the interval [0,10] using 1000 points
on the function (x**2 - 10*x - i) where i is the index in the "resulting
vector" taking the value of every integer on the interval [0,1000000].
As of now this code finishes in under one second on my GPU...