smex: insert hyphens when using spaces
erc: bury new buffers

This is annoying for them to popup while you are working on something
else.
erc: don't adjust width to window width

This only works for buffers with a window. If we burry buffers, we
don't have a window and a width to associate to them. It seems easier
to just use a static width.
erc: ignore server originated messages when tracking
erc: use the current nick face when we have a query buffer