It's just to have the tag in history.  The files are unchanged.

Almost.  A trivial lib/layer/cache.c remains.
I put all lib/generic/*.h into libkres_HEADERS, to be sure.
They rarely change anyway.

It was breaking on Darwin, and clang was throwing warnings.
Problem since ddb699d3.

documentation: reorganize chapters

See merge request !467

The manual page discusses basic usage of kresd, but completely lacks
configuration description. Users are pointed to
https://knot-resolver.readthedocs.io for reference. When visiting this
page, the most important information they don't have yet, is how to
configure kresd. This should be the first chapter in the documentation
to make it easier to find.

fix two nitpicks from clang-scan

See merge request !465

- utils.c: overflowing size_t is basically impossible, but well...
- stats.c: NULL would probably not cause a problem with zero length passed

Also guard all allocations in cache against this, via assert.
(Except in cases that would segfault anyway.)

I somehow forgot that case.  Unfortunately the cache optimization for
CNAMEs doesn't help this case, so we just do (up to) two probes.

policy: polish policy module up

See merge request !462

RFC 6303 section 3 explains that

   The SOA RR is needed to support negative caching [RFC2308] of name
   error responses and to point clients to the primary master for DNS
   dynamic updates.

Now SOA RR owner name matches query name so it can be cached.
Using zone name as owner would be more difficult so it is left for
further optimizations.

I've verified that nsupdate correctly determines that master name
does not exist and stops update process.

I've removed couple layers of indirection to make it easier to follow.
This should make it easier to extend the policy module.

CI: store respdiff database for debuging purposes

See merge request !443

Dockefile: fix TLS server in demo container

See merge request !463

Related: #297

It was just too noisy for default --verbose.

... to start fixing conflicts with changes in logging

Docker: fix Dockerfile for demo container

Closes #297

See merge request !461

libstdc++ was missing in the Alpine image.
At the same time, I've enabled DNSSEC validation, DNS-over-TLS, HTTP interface
and added explanatory message.

Covers changes to case handling of knot_dname_lf and knot_dname_cmp.