Convert XMPP codec specification to the new format
Add mod_register checks
Add STARTTLS test case
Add zlib compression test case
Remove forgotten comments
Better certfile location detection by the test suite
Fix the error report of an incorrect certfile
Test suite cleanup.

* Split test cases in groups.
* Increase a loglevel of common_test framework.
Add registration remove test case
Improve "unregister" test case
Don't include sub-elements in IQ results where it's not required
by the corresponding spec (RFC or XEP).
Advertise privacy lists support via disco#info
Add roster checks
Check item groups separately
Add mod_proxy65 test case
Add some MUC checks. Several cleanups
Add simple mod_offline checks
Fixed conversion to ezlib