Fix the user-setup-url unit test: return two values from the handle-check-id-setup, as required by the provider (the test failed because we recently added an assert in the provider code)

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re #19 some polishment of the provider API. The HANDLE-OPENID-PROVIDER-REQUEST keyword parameter SECURE-P is renamed to ALLOW-UNENCRYPTED-ASSOCIATION-P.

Ignore-this: 66a7a933dd660b3382d6c28c79e1b0a9

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Fix handling of unsupported association requests by the function HANDLE-OPENID-PROVIDER-REQUEST (switch the nesting of ENCODE-KV and HANDLER-CASE). Created an unit test which reveals the problem and covers handling of all kinds of usupporeted association requests.

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Refactor INDIRECT-REQUEST-URI and INDIRECT-RESPONSE-URI into a single INDIRECT-MESSAGE-URI function.

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