- Removed some commented code.

- Was showing free'd data.

- In DDNS, SOA RRs are not copied with RDATA DNAMEs - double free when freeing changesets
- Could produce a leak somewhere! (ixfr-in)

- Would cause crash when removing RR from non-existent nodes.

refs @2138

refs @2138

Conflicts:
	src/Makefile.am
	src/libknot/rdata.c
	src/libknot/rrset.c
	src/libknot/util/descriptor.h
	src/libknot/zone/zone-contents.c
	src/zcompile/parser-descriptor.c

- No need for block number now
- Added similar function, but works only on one RR.

- Added better test for next_dname_pointer.
- Small fixes and tweaks here and there
- Disabled tests for knot_rrset_rdata_compare - function is not written yet and is not trivial
- to_wire test still failing, needs a bigger rewrite

Conflicts:
	src/tests/libknot/libknot/rrset_tests.c

refs #2027 @3h

refs #2137

refs #2137

refs #2137

refs @2138

Coverity scan #981011 (Resource leak)

Coverity scan #970911 (Unchecked return value)

- Add missing descriptors.
- Extend descriptor structure with type name.
- Add conversion functions num<->str for types and classes.

refs @2138

Conflicts:

	src/common/descriptor_new.c
	src/common/descriptor_new.h