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I have forwarded a fix to Richard for him to examine before
committing because I don't trust myself to understand how it
all works yet; this was my first pass at modifying Roundup. 

My solution is in some sense the inverse of the one
suggested; roughly, the Roundup source is changed to use
Python 2.3's csv via a new (internal to roundup) module
rcsv; the latter detects if Object Craft csv is being used
instead and compensates, and also detects if no csv is
available and sets up the error message. The "fake" version
of Python's 2.3's csv is not a complete replacement, because
the iterator semantics are not available in 2.1, but it is
able to do the job in the way that Roundup presently uses
it. I thought it better for the long run to have the source
conform to the standard module and have the rcsv module fake
it for the pre-2.3 case rather than the other way around.