Make dc_id nullable in both dreamcast_clients and dreamcast_nte_clients.
Make dc_id nullable in both dreamcast_clients and dreamcast_nte_clients.

This relates to a change to the website code. To update a database for 
this change, run the following queries:

ALTER TABLE dreamcast_clients MODIFY dc_id char(8) NULL;
ALTER TABLE dreamcast_nte_clients MODIFY dc_id char(8) NULL;



Sylverant/login_server,Sylverant/login_server