Corrected privilege-related problems. Many functions now take a Connection instead of a Pers_no/Person combo. Added defensive code to protect the server in situations where active_connection is unexpectedly NULL. Added checks to most RPC handlers to make sure they are only called when there is an active connection. The added_by field for a person's membership in its letterbox conference is not the person itself, not 0. Testing Removed all new expected fails from the testsuite.
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