undid changes to test_backdoor; need more thinking on that because of .save

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/pcalg@237 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Reduced C++ compiler warnings

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/pcalg@238 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Restored original Makevars.in

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/pcalg@239 edb9625f-4e0d-4859-8d74-9fd3b1da38cb