Fix redirectSelf() for complicated PATH_INFO expressions.

For instance, those on profile pages. See of course REQUEST_URI
is URL-encoded, but PATH_INFO is not, so we need to compare
the PATH_INFO to a decoded REQUEST_URI tail, argh.
Rename "paper manager" to "paper administrator" in the UI.

I think this is a bit more consistent/easy to understand?
Internal: Separate review-requested check from deadline check.

Removes Conference::timeReviewPaper.
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Support an external review committee.