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KNOT_DNSKEY_FLAG_*: add missing flags

See merge request !929

load: fix update from differences with zone-in-journal

See merge request !926

Keymgr: list displays key sizes

Closes #602

See merge request !927

close #591

A COW transaction allows a trie to be used for reading concurrently
while a modified version of the trie is being prepared. The change
can be committed by swapping the new trie root in place of the old one.

Internally, this feature uses one bit reference counts to identify which
parts of the trie are shared between the old and new versions, which
parts are new-only (so can be mutated) and which parts are old-only
(and will be free()d after commit).

No functional change.

The point of this commit is to make it possible to stash a few
flags in leaf nodes as well as branch nodes, though we don't
yet exercise this possibility in any meaningful way.

This fixes a foolish mistake in the original qp trie data structure
declarations: the combination of unions and bitfields is a complete
disaster for portability, and it gets into dangerous territory wrt
compiler optimization. Instead, we just use a big enough word (uint64_t)
which is broken up into fields using accessor macros and inline functions,
and cast it to a pointer when necessary. We don't actually care about
the detailed layout in memory, just the numeric value, so a union was
the wrong tool.

related to #604

fixes #604

Fix errors in dnssec_nsec_bitmap_contains()

See merge request !925

I just minimally changed the code to be equivalent the to function
from knot-resolver. (identifier renames complicate the comparison)
I didn't try to verify that the result is completely flawless.

doc: fix typo

Closes #603

See merge request !924

distro/rpm: add conflict with knot-resolver < 3.0.0

See merge request !921

distro/arch: simplify PKGBUILD

See merge request !922

scritps: obs test build

See merge request !920

packaging updates

See merge request !918

rrsig ttl - fix updating from orig_ttl for all output and diff, see below

See merge request !917

RFC requires that unlike other rrset types, RRSIG must store different TTL for each rdata, to keep them equal to signed rrset's TTL.
But Knot only stores one TTL per rrset, fixing this by using orig_ttl from RRSIG and updating TTL while answer.

This commit also fixes this for knotc zone-read and knotc zone-diff commands.

Moreover, zone update from differences ignores changed TTL-only for RRSIGS. Changed orig_ttl is still diffed as it's part of rdata.