- Refactored node walking a bit (API instead of hard-coded trie walk)
- Double free fix (wrong merge probably)

Refs #4

- Simplified the RRSet signing function a bit (not so many args needed)

Refs #4

Conflicts:
	src/knot/zone/semantic-check.c
	src/libknot/dname.c
	src/libknot/dname.h
	src/libknot/dnssec/key.c
	src/libknot/rrset.c
	src/libknot/rrset.h
	src/libknot/zone/zone-contents.c
	src/tests/libknot/sign_tests.c
	src/utils/common/params.c

refs #4

Conflicts:
	src/knot/conf/cf-parse.y

refs #4

This is O(N) on both insert/search, but since the ACL lists are
several items long (usually), it is not an issue.
The lists are sorted from the longest prefix to the shortest, so
the first match is guaranteed to be longest prefix match.

Fixed a bug where NSID couldn't be switched off on reload, causing
malformed packets and/or extra bytes.
Since it's protected by RCU, it needs to be created on each server
reload and the old one should be freed after the RCU is synchronized.
Also removed rest of obsolete code and unified EDNS constants.

Not fixed as it should not be problem later with dnames directly
in RDATA (branch dname_refactor). Added note describing the problem.

Also updated documentation for functions where it was wrong.

refs #103, #4

Conflicts:
	src/Makefile.am
	src/knot/conf/conf.c
	src/libknot/dnssec/key.c
	src/libknot/updates/changesets.c
	src/libknot/zone/zone-contents.c
	src/libknot/zone/zone-diff.c

refs #4

- Quite a lot of changes had to be done, because some variables were only accesible locally.
- Some includes might not be needed, needs a second look.

Refs #4

refs #103, #4

- Wrong check: RRSIGs for all RRs.
- Wrong warning if DNSKEY for RRSIG is missing.

refs #137

Conflicts:
	src/libknot/updates/ddns.c

Problem was the function is copied from another one which
always decrements the arcount and trims the TSIG RR. But with
aggregated responses, this should be stripped not from first,
but from the packet actually containing the TSIG.

refs #122