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This reverts commit 63a86f7b.

add GOST algorithm support

See merge request !923

dnssec: implement commands in knotc to trigger immediate key rollovers

Closes #590

See merge request !928

The other `#ifdef HAVE_*` were moved in switches,
so that they don't rely on being the last before `default:`

The tests needed fixing up cases of using GOST as invalid values.

closes #602

Http to https

See merge request !930

www.gnu.org has offered https for years now.

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