Unit test refactoring
I spent time refactoring unit test for html_in converter. Especially I fixed problem with the regex to remove xmlns it was a little bit strong. (It should anly remove the default xmlns). Another approach could be to keep all xmlns, and add correct namespaces parameters for the Xpath query.
I also rewrote all the tests, to use boolean query with XPATH, so I can have generic test function.
And finally, I used all these new features to use xlink namespaces for <a> tag conversion.
Merge with the main dev/moin2.0 branch
I also did a merge with the main dev/moin2.0 branch, because BastianBlank made many change to the converter system. So I also spent time to adapt my HTML_IN converter to these new changes.