port init methods part of r919 to pkg + work-around (for now)


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/coin@927 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
add 'is_ytrafo' utility (currently unused) 

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/coin@928 edb9625f-4e0d-4859-8d74-9fd3b1da38cb