add 'distribution = "none"'

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/coin@924 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
move "ExpectCovar" and "ExpectCovarInfluence" to Classes.R

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/coin@925 edb9625f-4e0d-4859-8d74-9fd3b1da38cb