Mmgraph renamed MmgraphR for clarity

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/traminer@623 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
MmgraphR is the renamed and updated version of Mmgraph

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/traminer@624 edb9625f-4e0d-4859-8d74-9fd3b1da38cb