[Rd] R CMD versus Rcmd

[Duncan Murdoch]

I've just committed changes to R-devel (to become 1.9.0) to allow
scripts to be invoked using the Unix-style "R CMD command" in Windows.
"Rcmd command" will still work, but is no longer documented.

A build incorporating these changes should show up on CRAN tomorrow.

Running "R" by itself will start Rterm.exe.  You still run Rgui to get
the GUI version (or just click on the shortcut).

Duncan Murdoch