Layered ban and admin lists

[ForNeVeR]

We need to include layers of banlists.

Consider we have three chats: chat1 and chat2 belong to the main network, and chat3 is a side chat.

We need to change Grinder so chat3 is semi-isolated from the main network: admins of the main network are also admins in chat3, but chat3 admins aren't admins in chat1 and chat2. People banned in chat1 and chat2 are also automatically banned in chat3, but not the other way around.

In other words, chat3 should automatically receive admins and bans from the main network, but the main network shouldn't receive admins and bans from the chat3.