update formalism in S

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/correg@264 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
update criterions to compare Structures

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/correg@265 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
accent

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/correg@266 edb9625f-4e0d-4859-8d74-9fd3b1da38cb