If user is connected without network, try "default" network first, if it
exists. If not, try "user" network. If it doesn't exist too, just use
the first one.
Also configs converted from old configs have "default" network instead
of "user" one.
Buflines need to know which part of text to wrap with the timestamp. The
second parameter to `AddLine` (and shorthands) is that text, which after
wrapping is added as the `text` parameter to `NamedFormat`.
Timestamps are formatted at the moment buffers are flushed to the
client. The client parameter to `GetLine` provides access to the User
and the new server-time capability.
This fixes a bug where an unauthed IRC connection will cause your
clients nick to be the default nick. But this is before we update
the client to use this nick. If a client tried another nick when
connecting then they are still expecting this nick.
