pretty-html seems to be broken in python2.5

[Aaron Bentley]

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Martin Pool wrote:
> I'm trying to build and upload the docs and it looks like the
> pretty-html function won't work in python2.5.  It needs
> htmltreebuilder, which doesn't seem to be present in the version of
> elementtree included with python2.5.

The reason for using htmltreebuilder rather than the default tree
builder is because docutils emits named[1] entity references.  I've
found no way to get the default tree builder to decode named entity
references, though of course it handles numeric ones with no trouble.

[1] (e.g. é rather than é)

Aaron
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