mlr 2.17.1

Learners - bugfixes

• remove regr_slim learner due to pkg (flare) being orphaned on CRAN

Measures - bugixes

• remove measure clValid::dunn and its tests (package orphaned) (#2742)
• Bugfix: tuneThreshold() now accounts for the direction of the measure.
  Beforehand, the performance measure was always minimized (#2732).
• Remove adjusted Rsq measure (arsq), fixes #2711

Filters - bugfixes

• Fixed an issue which caused the random forest minimal depth filter to only return NA values when using thresholding.
  NAs should only be returned for features below the given threshold. (@annette987, #2710)
• Fixed problem which prevented passing filter options via argument more.args for simple filters (@annette987, #2709)

Feature selection - bugfixes

• Fix print.FeatSelResult() when bits.to.features is used in selectFeatures() (#2721)
• Return a long DF for getFeatureImportance() (#2708)

Misc

• pkgdown: Move changelog to Appendix

• Account for {checkmate} v2.0.0 update (#2734)

• Refactor function calls from packages (<pkg::fun>) within ParamSets (#2730) to avoid errors in listLearners() if those pkgs are not installed

• listLearners() should not fail if a package is not installed (#2717)