Phabricator/February 2016 upgrade

This page collates for convenience decisions that arise in this discussion, related to the pending significant upgrade of Phabricator.

Should teams have custom forms?

 * Yes, many teams have valid use cases for them. The risk of cluttering the UI can be minimized by keeping forms visible only to members of team projects.

Should we migrate existing projects to be subprojects?

 * See https://phabricator.wikimedia.org/T123078

How will we support projects using the Sprint Extension?

 * Keep sprint extension enabled?
 * Christopher is trying to updated the Sprint Extension to keep it compatible.