templates: spiff out the interface templates

templates: spiff out the interface templates

Its interface is really too plain (I know you know it). While I'm not
a graphic artist, I think I could help you with adapting Virtual Exim's
layout, which itself is an adaptation of the free layout from
http://www.bluerobot.com/web/layouts/ . I think I'm gonna do this anyway
on my setup, so I'll share the diff with you. Actually, we could maybe
make it even nicer by copying some other design.