allow device configs to be retired, start base and runmode config version nums from 1 not 0

[marc1uk]

SetupDatabase.sh changes:

• change runmode_config_id and base_config_id to start from 1, not 0.
• add retired option to device_config, along with associated user and date
• add function to retire all base and runmode configurations containing a given device configuration with a given version number
• add functions to retire all base and runmode configurations containing a given device configuration with a version less than a given number
• don't create test_device entry in devices table
• do create empty runmode config in devices table
• minor bugfix: update PGDATA if user changes PGROOT

middleman changes:

• add ClearClients button to clear connections maps for all sockets. This triggers the next UpdateConnections call to invoke 'connect' on all clients.
• improve ClientsList info slow control