Description
Computes the affine hull of a polyhedron. This is the affine subspace with the same dimension as the polyhedron, containing the polyhedron.
i1 : P = stdSimplex 3
o1 = P
o1 : Polyhedron

i2 : Q = affineHull P
o2 = Q
o2 : Polyhedron

i3 : linealitySpace Q
o3 =  1 1 1 
 1 0 0 
 0 1 0 
 0 0 1 
4 3
o3 : Matrix QQ < QQ
