Test BV block orthogonalization (length 20, l=2, k=8) with non-standard inner product.
Orthogonalizing leading columns
  Difference ||cached-BX|| < 100*eps
  Level of orthogonality of Q1 < 100*eps
  Residual ||X1-Q1*R11|| < 100*eps
Orthogonalizing active columns
  Level of orthogonality of Q2 < 100*eps
Overall decomposition
  Level of orthogonality of Q < 100*eps
  Residual ||X-Q*R|| < 100*eps
