* replace guchar and gint by AvahiProtocol, AvahiIfIndex at many places where it...

* replace guchar and gint by AvahiProtocol, AvahiIfIndex at many places where it make sense
* change avahi_add_{service,txt}_strlst() to copy the string list
* gcc warning fixes from Ikke
* limit number of DBUS connections
* limit objects created by a DBUS client
* limit number of clients
* limit number of entries a client may create
* add legal blurb to avahi-discover
* remove some obsolete import prototypes from avahi-discover
* don't include config.h in dbus.h
* add string definitions for DBUS errors

git-svn-id: file:///home/lennart/svn/public/avahi/trunk@212 941a03a8-eaeb-0310-b9a0-b1bbd8fe43fe