warning methods about not importing from methods ...

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/robast@729 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
some minor updates for version 1.0

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/robast@730 edb9625f-4e0d-4859-8d74-9fd3b1da38cb