[avahi] Check unit testing for Avahi

[Emanuele Aina]

Trying to get confidence with the codebase I've added support for the 
Check unit testing system (http://check.sf.net) to Avahi.

I've ported some of the test program in -core and -common, making them 
fully automated (no printf).

As I have only a 56K I work offline more often than not, and I've put my 
work in a mercurial (http://selenic.com/mercurial) repository available 
at http://techn.ocracy.org/avahi-check/. From the main page at 
http://techn.ocracy.org you can download a tarball if you prefer.

Otherwise, to get a patch versus the latest imported SVN revision use this:
hg clone http://techn.ocracy.org/avahi-check/
cd avahi-check
hg diff -r upstream

-- 
Buongiorno.
Complimenti per l'ottima scelta.