Updated mediawiki/extensions
Project: mediawiki/extensions/Flow  6203ef95d919f058cc4d5e51bcdf149fcdda86d4

Deprecate ApiQueryRevisionContentFlow.

Its functionality is duplicated in the more generic ApiQueryFlow, and both occasions
where it was used were in situations where the data in question was already available
from other sources without an API call.

Also moved ui-functions.js to the base module instead of the discussion module.

Change-Id: I834ab83e532b14c957d629e1a2de161b1180d9ca