* urllib.parse: Make return type of unquote_from_bytes str.
* urllib.parse: Reject encoding when quote is passed bytes.
encoding and errors must not be supplied to quote_plus and
quote if the first parameter is a bytes, or a TypeError is raised.
So overload quote and do not put encoding and errors in the
version where bytes is the first parameter.
quote and quote_plus also allow string and safe to be of different
types. Also allow that in the stubs.
