V2.1.0 Align with randomForestSRC 3.1 release
V2.0.x was "archived" when randomForestSRC was temporarily removed from CRAN. This release is to "un-archive" the CRAN version.
- Remove survival tests and cached data sets to conform to CRAN release criteria. Future work to move this back and use skip_on_cran for tests and examples
- Finally fix the gg_error plot bug (issue #35) where the curve was not showing up.