Accurately report institution activity

Info on whether an institution is "active" or not appears in two
places in the UI: Special:Institutions and institutions' pages.
This patch ensures that info is accurate. A column was added
to the ep_orgs table to make this possible.

Change-Id: I1c77ac6ae4b3a875586ec80cbb60f745433c8083
Merge "Accurately report institution activity"