This patch - introduces a new server flag "S" to indicate that the server can handle the SERVICE command (on server links), - implements the IRC command "SERVICE" for server-server links, - uses the "SERVICE" command to announce IRC services when a new server connects to it, - and fixes the Send_Message() function to let it send messages to services using a "target mask". If the remote server doesn't indicate that it can handle the "SERVICE" command (it has not set the "S" flag), services are announced as regular users as before.

This patch enables ngIRCd to handle IRC services as real services, and not as "fake users": - Set correct client type CLIENT_SERVICE for services, - Change log messages to include correct client type, - PRIVMSG: allow users to send messages to services, - Send services nick names to other servers (as users). Please note that this patch doesn't announce services as services in the network, but as regular users (as before). Only the local server knows of services as services (see LUSERS command, for example). It is up to one of the next patches to fix this and to introduce the SERVICE command in server to server communication. The propagation of services as regular users between servers doesn't limit the functionality of the IRC services and will be the fallback for servers that don't support "real" services propagation in the future.

This patch allows ngIRCd to detect right after receiving the SERVER command from the peer whether the RFC 1459 compatibility mode must be used or not. And it fixes the announcement of users during establishing new server links with such peers.