In the old form the wrong type of extension
was added, this prevented any reconfiguration
of purpose allocations in the dotfile.
Now the right type of allocation is used
allowing users to overwrite the config easily.
How this is done is described in
the purpose layer.
The erc//servers function removes the :ssl variable from the list so it
can be passed directly to erc-tls, but this means that subsequent
connections will not use TLS. Thus, we should operate on a copy of the
list instead.
