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Features added
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* Changed setup.py so that library_dirs is also guessed. This should
help with compilation on the Mac OS X platform, where otherwise the
wrong library (shipping with the OS) could be picked up.
* Tweaked setup.py so that it picks up the version from version.txt.
Bugs fixed
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* Do the right thing when handling namespaced attributes.
* fix bug where tostring() moved nodes into new documents. tostring()
had very nasty side-effects before this fix, sorry!