allows Geometry.from_xml() to accept path for materials file #2326
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This PR attempts to allow the materials.xml filename / filepath to be specified when creating a geometry from a xml file. Perhaps this is slightly more flexible that the hard coded use of 'materials.xml' which we have currently.
I have added to the existing test to check the geometry is still loaded for a few different combinations of arguments.
Also it opens up the potential use of materials=None to pass in no materials. In the longer term I would be keen to propose the option of no materials when loading the geometry.