620255aef7
This change adds a new item to the group configuration: a list of groups whose members should be included in this one. This makes it possible to set up a hierarchy of included groups, which can make it easier to maintain complex access control lists. To accomplish this, two new database tables were added, called AccountGroupIncludes and AccountGroupIncludesAudit. The relevant support code was added around them, largely based on the existing code for handling indivdual account membership. In addition, caches for group information were added, paralleling the caches that already exist for accounts. Change-Id: Ib6990c17739f28f38bc13961143db7ce79251567