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+ Visibility in errcode.c, dname.c, descriptor.c, consts.c

Converting to lowercase when saving to zone proved insufficient,
because case-insensitive comparison of RDATA would be needed in some
scenarios - e.g. in IXFR (SOA replacement) and DDNS processing.

Moved the conversion to packet parsing - all dnames in RDATA
are converted to lowercase when parsed from wire. RDATA parsed
from zone file are converted there (in scanner_process()). Later
the conversion may be moved to a lower level of parsing (and with
some option to turn it on/off).

QNAME is unaffected by this change.

Conflicts:
	Knot.files
	src/knot/nameserver/update.c
	src/knot/nameserver/update.h
	src/knot/server/tcp-handler.c
	src/knot/zone/events.c
	src/knot/zone/zone.c
	src/knot/zone/zone.h
	src/libknot/packet/net.c
	src/libknot/rdataset.c
	src/utils/nsupdate/nsupdate_params.h

missing

- changesets.c
- contents.c - just removed debug code

- includes not finished yet

 - Simpler DDNS signing, simpler changeset merging (todo: fix leaks)
 - Removed some needles helper functions and zone adjusting

removed most of cruft from zones.c
moved relevant stuff to appropriate files

problems:
- still a lot of duplicated code with changesets (ddns, signing, ixfr..)
- can't store changesets after application (zone.c:186)
- ddns and transfers are unsafe until made into serialized zone events

- deprecated journal functionality was thrown away
- half of the code from zones.c was moved to appropriate places (zone,
  zonefile, journal)
- there are still several functions that should rather be in the
  changesets code, TBD

- kept RRSet copies somewhere (node has to create them now)
- replaced knot_rrset_t with knot_rrs_t elsewhere
- semantic checks simplified

Prior to this change, non-apex DNSKEYs were not signed and invalid NSEC
records were generated for these nodes.

- Will leak
- Untested

The config.h is now implicitly included using -include option of the
compiler. After this change, config.h need not be placed at the first
position in all source files.

- RR insertion function now returns zone RRSet.
- Removed reduntant zone contents / node API functions
- Cleanup.

- Removed rrset->rdata_indices, RDATA lengths are now stored inline together with RR's TTL
- Added function to get RR's TTL - TTL of the whole RRSet can still be obtained, but it will default to the first RR's TTL or 0
- Renamed few RRSet functions, removed a few too - the file still needs a cleanup and function reordering
- Special handling for RRSIGs during AXFR-out no longer needed (yay)