drd_server 6.x-2.1

NEW: Implement more requirements and categorize them to be properly displayed on the domain overliew list
NEW #1534424: Implement a modules overview at admin/drd/modules to show modules stati for all modules across all cores and domains
NEW: New operation to execute arbitrary PHP code at the remote domain
NEW #1391314: Implement support for blocks so that each remote domain can deliver any block for the domain detail page on the dashboard
NEW: Implement hook_requirements to deliver some more information back to the dashboard
NEW #1499208: Change (simplify) the way how "Update domain info" delivers the collected information back to the dashboard
FIX #1735024: Allow checking for drd_server being installed even if there is no permission set for anonymous users
FIX: Flush page cache when changing maintenance mode
FIX: Restore previous maintenance mode after db updates
FIX #1727948: Avoid PDOException if a table (e.g. comments) doesn't exist and return zero instead