[Rd] RSetReg.exe

[Gabor Grothendieck]

R.exe, Rgui.exe, Rcmd.exe and Rscript.exe all support the --help
argument but RSetReg.exe --help ignores the argument and attempts to
set the registry key.  Since one might try this as a first attempt to
figure out what the command is all about this seems a bit dangerous.
It would be nice if it responded to --help as the other R*.exe
commands do.

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