* rename avahi_service_name_snprint() to avahi_service_name_join()

* rename avahi_service_name_snprint() to avahi_service_name_join()
* add avahi_service_name_split() and make everything use it
* change avahi_normalize_name() to work on a supplied buffer instead of malloc'ed memory.
* add avahi_normalize_name_strdup() that retains the old behaviour avahi_normalize_name()
* same thing for avahi_get_host_name()/avahi_get_host_name_strdup()
* Rewrite domain name escaping and validity checking code
* Remove superfluous memory allocationsfrom various browsers and do some other major cleanups
* add new global macro AVAHI_CHECK_VALIDITY_RETURN_NULL() and modify many things to make use of it
* add AVAHI_LABEL_MAX
* patch everything to make use of AVAHI_LABEL_MAX and AVAHI_DOMAIN_NAME_MAX
* add pretty printing for NS records
* add partial pretty printing for SOA records
* add many more validity checks to various user API functions

git-svn-id: file:///home/lennart/svn/public/avahi/trunk@708 941a03a8-eaeb-0310-b9a0-b1bbd8fe43fe