Bumped retistructgui to 0.5.9

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/retistruct@1309 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Fixed so that retistructdemos can be at older version

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/retistruct@1310 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Fixed the rgl error

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/retistruct@1311 edb9625f-4e0d-4859-8d74-9fd3b1da38cb