ID 49: Admin access to Formage console

This change syncs OpenMRS IDs that are members of the "dashboard-administrators" group with Formage's internal list of users. In other words, admins can use their OpenMRS ID credentials to log in to Formage. In other, other words, it makes Formage actually usable for us :-)

It also adds a link to formage in the Admin sidebar, and blocks access to the formage panel url "/panel" for users who aren't admins, as a security precaution.