[issue2170] rewrite of minidom.Node.normalize

[Malte Helmert]

Malte Helmert <helmert at informatik.uni-freiburg.de> added the comment:

Short review: code looks good to me, patch applies cleanly to trunk,
passes tests.

@akuchling: I don't know if you remember, but this rewrite was
originally suggested by you on a bug day some time ago. I think David's
patch is ready to be applied.

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