[Rd] data frame subset patch, take 2

[Tony Plate]

Martin Maechler wrote:
 > [snip]
 > Note however that some of these changes are backward
 > incompatible. I do hope that the changes gaining efficiency
 > for such large data frames are worth some adaption of
 > current/old R source code..
 >
 > Feedback on this topic is very welcome!

Martin, my feedback would be that changes that improve the efficiency of 
data frames are very welcome.  And if implementing them in a sensible 
manner breaks some old code in a way that is not obnoxious, i.e., by 
making some previously sensible behavior less sensible, then it is 
worthwhile to do so.  (Where sensible is defined in terms of the new 
semantics.)  As a particular example, I would consider it OK to break 
old code that relied on default row names being character data. (But 
this may not be necessary).

-- Tony Plate

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> Martin
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