o RooMultiVarGaussian

   - Reorder ctors so that version with const RooArgList& for the mu-vector is visible
     to the workspace factory


git-svn-id: https://root.cern.ch/svn/root/branches/v5-34-00-patches@48498 27541ba8-7e3a-0410-8455-c3a389f83636