Comment 13 for bug 81434

I discussed with Emilio to use urllib.urlencode() avoid this long url-strings. This patch against bughelper.main r122 uses urllib.encode() and modify the "search - upstream" -parts in HTMLOperations.py.

If this works as expected adding a "search in duplicates"-option would be the next step. I think it is also nice to add these options to bugnumbers. We should also think about using urllib.urlencode in the "status"- and "importance"-filter.