SEO improvements to avoid URL duplication #1009
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Should avoid issues like these matching URLs:
https://www.question2answer.org/qa/user/pupi1985
https://www.question2answer.org/qa/user/Pupi1985
Also works with tags, unanswered questions, questions page, hot page.
Also turns 302 redirects to 301 redirects, so that search engines stop looking for the incorrect URL.