Add murmur.

[contact . ng0]

This patch adds an proposed change to mumble, murmur as an output.
Murmur is the server of mumble. I tried to use an inherit package first, but 
the amount of code for the minor difference between mumble and murmur is not 
worth the length of a new package.
I'm not sure it murmurd needs the "/lib" of output:out (mumble) at runtime,
in the absence of a possibility to test this, we can onl figure out once a
service for murmur is written.