refs #19

refs #19

When concatenating FQDNs, the first name \0 label must be cut.

All the functions using them we're remade using the new wire based
API. Not safe for non-linear names though.

refs #19

fixes #23

refs #21

refs #23

More cleanup is required though, there are a lot of duplicate functions.
Ultimately, most of the packet functions should be gone in favour of the
knot_wire_* ones.

refs #22

This makes most of the use of the MM context apart from
several places, which are to be refactored:
- constructed RRs
- QNAME

refs #22

- Removed functions from zone-contents - no need for them to be public.

- Mimics BIND

Two reasons:
- There's some rare race condition in the queue implementation
- Doesn't scale and current performance is almost the same (-~2%)
- Created branch with the queue still retained for future inspection

This should be properly solved by better zone fetching API with
a) refcounting b) locking.

refs #31
fixes #30

- Added a simple list to check already inserted CNAMEs
- Removed obsolote checking functions
- Nightly test will fail, because CNAME loops will be loaded and xfr-in'd

Change-Id: Ic80408a129bf42e97b9e88392d318e89cfbad3e5