Create new module : notification

[gfriloux]

This module will be responsible of handling management of groups of users, and to deliver messages to each member of a group, when asked.

Main functions :

• .notification groupadd $groupname : Create a new group.
• .notification groupdel $groupname : Delete a group.
• .notification useradd $groupname $username : Add a JID to a group.
• .notification send $groupname $message : Send message to given group.

First modules to use it should be :

• Alert : Link a notification group to be warned for each command.
• GDB : Send detection of new coredumps to the dev group.