- re-added a generic version of stabsel (which depends on package stabs)
- explicitly specify the packages for functions that are implemented in 
  packages that are listed as "Suggests:", e.g  we now use "party::ctree_control" etc.
- updated NEWS.Rd and removed inst/CHANGES


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/mboost@799 edb9625f-4e0d-4859-8d74-9fd3b1da38cb