integrated tmcdd.R into tmcd.R - added demo(..) and more

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/robustbase@623 694ef91d-65df-0310-b7bb-92e67a308ead
many small and less small "deterministic MCD" related changes;
 notably speedup, mahalanobisD(), no need for repmat()

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/robustbase@624 694ef91d-65df-0310-b7bb-92e67a308ead