Patch contributed by Bruno Santos:
 - "etc/config.sh/CGAL":
   - Indented the contents of the recently added if block.
   - Added comment about using system versions.
   - Library paths are now only added if the respective version is not "boost-system" and "cgal-system".

 - "src/renumber/Allwmake":
   It now relies on the previous file to get the version for
   Boost (the same way as in "makeCGAL"). This is so that it will also
   build "SloanRenumber" if "boost_version" is set to "boost-system".

 - "applications/utilities/mesh/generation/Allwmake":
   It now also relies on the script "config.sh/CGAL" to get the
   version for CGAL. If "cgal_version" is set to "cgal-system", it
   will now also build "foamy*Mesh" utilities and respective
   libraries.

Resolves report http://www.openfoam.org/mantisbt/view.php?id=1232