Comment 24 for bug 171117

Thank you, Robin, that's a great job. Currently your change is in http://luther.ceplovi.cz/git/inkscape-ungroup-deep.git/commit/?h=iterative&id=00a19b7d3c31b16d0dbe1bd2a6483672c17e4db4 and I will (after a bit of clean up; I wanted to make the script PEP8-compliant anyway) merge it back to the master branch soon.