distr: small bugfix in qqbounds

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/distr@968 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
distrMod: qqplot now by default has datax = TRUE;
          some minor changes in returnlevelplot

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/distr@969 edb9625f-4e0d-4859-8d74-9fd3b1da38cb