consolidate help files and fix some code.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/clusterds@234 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
added in DSD_MG and MGC.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/clusterds@235 edb9625f-4e0d-4859-8d74-9fd3b1da38cb