Simple wrapper for xdg-open functionality. Simply refers
to xdg-open except if there exists mimeo on the system
which it will refer to instead.
So, a simple preference modificator for mimeo over
xdg-open since that is my preference too.
Also gave it a short name so I can do open whenever I
want and don't have to tax my left hand with tying xdg.
Added configuration for urlview which neomutt uses to parse out urls
from emails to, by default, make use of xdg-open to decide which program
to open them in instead of sending them to lynx.