MaraDNS snapshot update

I have made some improvments to MaraDNS in today's snapshot

• MaraDNS compiles again (albeit with one warning) with configured to be authoritative-only ( ./configure --authonly; make )
• Tests revised to pass when running a snapshot version of MaraDNS
• New script that only runs the tests relevant for the authoritative-only compile of MaraDNS added

It can be downloaded here.