Additional fixes found while looking at ticket #2532: when given a screen name...
Additional fixes found while looking at ticket #2532: when given a screen name as API parameter for a profile, do the nickname lookup on local users only. The profile table can't guarantee unique lookups, so using names isn't currently safe there. This won't affect anything using local nicknames correctly, and may avoid some weird bugs if there were conflicts between local and remote nicknames.
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