[XML-SIG] Underdeveloped installer of the pyXML-0.6.3

[Evgeny Cherkashin]

Hi!

I just installed codecs aware pyXML-0.6.3 package and figured out, 
that at least for python 2.0 the package installer should replace
python's original pyexpat.pyd module (in python's DLLs folder under windows), 
as it is usually loaded by pyXML (no that new in package). Or, may be, remove all
old pyexpat.pyd before installation. This results in pyXML does not support codecs.

Thank you for codecs inclusion in the package.

Evegeny

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