RobAStBase: introduce jitter for points in ddPlot for DiscreteDistributions
RobAStBase/RobExtremes: fixed issue with updateStep in kStepEstimator when using interpol risks (somehow modifyIC had not been attached in prior steps...)

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/robast@722 edb9625f-4e0d-4859-8d74-9fd3b1da38cb