[ESS] ESS default R not the newest (MS Windows)

[Stephen Eglen]

> It seems to me inferior-R-program-name should refer to the newest
> version of R, whether that version is user-specific or system-wide.
> By this I mean that when ESS starts up and fills in that variable, it
> should fill it in with the newest program path.

hi Ross, a problem with this approach is that if you have a development
version of R on your path, it will find and use that.  You might want
that, but there are likely many systems where some users want to use "R"
and some "R-devel".  "M-x R-newest" is there for running the latest
version.
Stephen