fix incorrect hash tag for Backpermute
fix incorrect hash tag for Backpermute

Ignore-this: d467abe95c9922aa6f60ba58f955f9e4
- This incorrectly used the output dimension rather than the permutation
  function (as was intended).
- Ticket #11

darcs-hash:20100720035005-dcabc-32ffccd076d0b937dc64d6161f0c1115f1c16335.gz

sjfloat/accelerate,rrnewton/accelerate,robeverest/accelerate,robeverest/accelerate,wilbowma/accelerate,wilbowma/accelerate