Framework to build dane support
Create a hosts_try_dane transport option, does nothing yet
Add current draft of SMTP with DANE
Add DANE RFC (6698) for reference
Coding style closer to project norms
Add interface documentation for the DANE library
Basic DANE entry points
Fix development-testing induced crash on second use
General discussion of DANE usage
Sketch in library interface
Testsuite basics.

Not actually excercising DANE yet,
this will take additions in the fakedns and
probably changes in certificates.
Test development
Ignore dane-related debug out in non-dane testcases
On a host lookup name->MX->A->ip sequence, require both stages to
be dnssec before declaring the lookup was secure.
Add support in the fakens utility for marking records as "secure"
and returning an AD bit for lookups.
Add support in the fakens utility for TLSA records
Copy latest SMTP-with-DANE - draft 11
Diffs for draft 11
Verifiable conn with DANE-EE(3) / SPKI(1) / SHA2-512(2)
Add direct-A test