add covComed() [after testing / compatibility / minimal testing]

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/robustbase@663 694ef91d-65df-0310-b7bb-92e67a308ead
typo


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/robustbase@664 694ef91d-65df-0310-b7bb-92e67a308ead