msxml3: Implement property SelectionNamespaces for XPath, domdoc properties fixes (resend)

[Adam Martinson]

After the domdoc <-> xmlDoc connection is no longer an open question, 
the domdoc::properties pointer can be removed and rerouted through 
xmlDoc::_private::properties as long as it's impossible to have a domdoc 
with domdoc::node.node == NULL.  With all of the checks for this, the 
current code suggests that it's perfectly possible.

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