Create a test service testing basic service functionality

Put it under a new test/ directory for all such basic test modules.
Add admin operator permission lookup to services
services: Abstract sending a user a NOTICE with message splitting into a method tellUser()
Add a TODO to service.tellUser for a race cdn I realised could happen
service: Set host, ident and gecos on self.user

Allow subclass to set them custom, else default to nick and server name.
service: Fix a race cdn where a user might disconnect before we try to send them a message

This is mainly a problem in callbacks and stuff, but we put it in the helper function to keep it simple.
service: Handle nick collisions with our LocalUser

Bitch-slap the other user.