redesign of sparse LTS
added methods for sparse LTS
added Huber correlation
removed option not to select a final model in sparseLTS()
added code for sequential models
added functionality for robust LARS
added predict method and standardized residuals for "seqModel" objects
added perry() methods; minor changes in help files
added code for coefficient plot
added code for optimality criterion plot
finished code for plots
sparseLTSGrid() is now deprecated
added code for model selection based on prediction error
added plots for models selected via prediction error
finished redesign