Simple {id, pid} cache

A simple to resolve pids from client ids...
add Project header
Clean up junk
Setup childspecs for DORA machines
Setup the DORA cache server

DORA cache server resolves client ids into pods and also talks to the
dora_dyn_sup to spawn new client FSM's
A few changes to pool functions

I change my mind on how to manage the address pool and leases, so some
refactorings are taking place..