- cross-validation:
  *  improved speed when dense_mu_grid = TRUE is used 
     (now there is really no increased run time with this arument)
  *  improved plot function for cvriskLSS objects
  *  added documentation for plot function
- stabilization: changed factor to median absolute deviation
  (currently only in GaussianLSS())
- additional minor changes in manuals


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/gamboostlss@92 edb9625f-4e0d-4859-8d74-9fd3b1da38cb