Stuff currently supported:
* Assigning a flag group to a user in all channels (`flaggroup_user`)
* Assigning a flag group to all users in a channel (`flaggroup_channel`)
Stuff needed:
* Assigning a flag group to a user in a channel (`flaggroup_userchannel` ?)
* Assigning a flag group to a mode in a channel (`flaggroup_modechannel` ?)
* Assigning a flag group to a mode in all channels (`flaggroup_mode` ?)