[TxMt] R bundle: Command Usage

[hadley wickham]

> I think that's a bit unclear at the moment. Hadley Wickham, I think
> did the original import. Then Allan did some cleanup work on it. Then

Yes, I did the initial grammar, and a command to send selected text to
the R application.  I haven't contributed to anything else because
that seems to be all I need for my way of working - (now) from the
terminal, and using source frequently.

Hadley