Merge branch 'amorilia' into next

Use SETfirstt_ and SETsecondt_ for type conversion [amorilia+alphax]

Rewrite qh_setappend to avoid some g++ 4.1, 4.2, and 4.3 strict_aliasing errors.
  Orion Poplawski (orion@cora.nwra.com)
  http://www.rpmfind.net/linux/RPM/fedora/12/ppc/qhull-devel-2003.1-13.fc12.ppc64.html