[Rd] proto and baseenv()

[Peter Danenberg]

Quoth hadley wickham on Sweetmorn, the 56th of Chaos:
> You might want to have a look at the mutatr package which implements
> prototype OO with the behaviour you're looking for (I think).

Hey, Hadley; I remember your prototype stuff from DSC 2009. I saw some
slides of yours that discussed proto, and was wondering whether mutatr
was still maintained.

Would you mind sending me that paper off-list, if necessary?