#2142 absint (defined in fourie)

[Barton Willis]

(%i1) load(fourie)$

(%i2) absint(abs(x^2-1),x,-1,1);
(%o2) 0

The correct result is 4/3. The user documentation suggests that absint can integrate abs(sin(x)).
But it gets this wrong too:

(%i4) absint(abs(sin(x)),x,0,2*%pi);
(%o4) 0