remove R-Extended
remove R-Extended
Squashed 'R-Extended/' content from commit 4c5a2f5

git-subtree-dir: R-Extended
git-subtree-split: 4c5a2f5f6a2178d9adce35e40e9e7e1d971c67ca
Merge commit '68482ddcf86b79a729eaa09cad4ff9944d57357b' as 'R-Extended'