[ESS] recognizing R-alpha with ESS

[Stephen Eglen]

 > ;; but these are not :
 > (defun R-beta (&optional start-args)

 > (defun R-alpha (&optional start-args)

 > (defun R-rc (&optional start-args)

 > (defun R-pre-rel (&optional start-args)


hi martin, if names like "R-alpha" are anywhere near as standardly
used as R-devel, why don't we just extend the regexp that searches for
R versions, namely:

  ess-r-versions is a variable defined in `essd-r.el'.
  Its value is 
  ("R-1" "R-2" "R-devel" "R-patched")


Stephen