[XML-SIG] xml.xpath.SyntaxException

[Alexandre Fayolle]

When importing xml.xslt, the following exception is raised:
AttributeError: 'xml.xpath' module has no attribute 'SyntaxException'

I've fixed this by adding the following line to xml/xpath/__init__.py:
from XPathParserBase import SyntaxException

Another solution could be importing SyntaxException from somewhere else in
xslt. However, since xpath.SyntaxException was widely used, I thought the
first way was easier. 

I can commit the patch if you think it's correct. 

Alexandre Fayolle
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