[44net] portal purge

At my request, we're cleaning out obsolete entries from the portal. A reminder is sent after 3 and 6 months with no login. A warning is sent after 9 months with no login. A notice is sent after 12 months with no login. After 15 months, the user, their network allocations, and any gateways belonging to them are deleted. At the current time, there are 3 gateways and 70 allocations to be so deleted. - Brian