Update campaign settings

Save a Research campaign's settings in place, all or nothing: its name, interview count, audience, schedule and study, from the next admission day; results continue on the same campaign, where an edited question starts fresh from its first answer after the change and every unchanged question keeps its history. Whom it interviews (its profile's customers or its stores') never changes. Nothing is charged at Save: delivered interviews accrue against the plan. Pass expectedSettingsRevision from research_campaign_settings_get_v4; a Save whose settings moved since is refused (STALE_WRITE). Pass reviewedEstimate from research_campaign_settings_quotes_get to also refuse one whose estimate moved, or null to save at the current estimate. A person confirms it.