Cleaned up internal files; bugfix in documentation of minDiscrPath

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/pcalg@220 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
added news file

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/pcalg@221 edb9625f-4e0d-4859-8d74-9fd3b1da38cb