[MERGE] Implement xml8 serializer

[Aaron Bentley]

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Harald Meland wrote:

> You appear to change the file id of xml6.py; is that by intention?
> Also, by renaming xml5.py to xml8.py, any changes other people might
> have for xml5.py will now be attempted merged into xml8.py; is that by
> intention?

Yes, it is by intention.  As I noted in my message, I have changed the
inheritance heirarchy so that older formats derive from newer ones.
This means that most of the code that was present in xml5.py now lives
in xml8.py.  The id change to xml6 is not strictly necessary-- it is an
artifact of the fact that I first changed xml5 to xml6, and then to xml8.

Aaron
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