Module R_mode (.ml)

module R_mode: sig .. end

• a "R" output (using Ed_outputs.interactive_output),
• a "r_eval" command which sends the contents of the active sourceview to the background R process attached to the "R" output. If some text is selected in the view, only this text is sent to R,
• a "R" mode, with a default key binding "C-p" to call the "r_eval" command.