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We are not RFC 7958 compliant and support only XML with just root zone
TA. Full compliance would require either proper Lua XML parser or CMS parser
and both are hard to get packaged in Fedora and elsewhere.

Also timestamps related to TA validity are limited to UTC timezone
because cross-platform timezone parsing is hard.
(Mac OS libc does not have usable strptime(%z).)

Closes: #435

ci: stabilize pytests

Closes #427

See merge request knot/knot-resolver!744

In our CI, this test ocassionally fails. This is most likely due to
delays in kernel processing due to many virtualization layers coupled
with massive paralelization of tests.

Closes #427

Attempt to increase test stability in CI under high load.

Docker uses 32768 - 61000 as ephemeral ports. Don't use
this range for kresd to avoid collisions.

ci: respdiff - generate additional reports

See merge request knot/knot-resolver!742

CI: enforce -Wpedantic

See merge request knot/knot-resolver!743

-Wpedantic is only enforced in CI, as we only have it fixed with c11
standard, and I didn't want to force c11 dependency for everyone yet.

The script has been unused for longer time.
Almost all remaining C warnings are just "FIXME" comments :-)
and I didn't touch the JS warnings.

None of these seemed to be errors, but it seems better to clear these.

It's perhaps unfortunate that the output value of buflen had +1 change
in meaning in commit 19a3cad6, but the name clearly indicates that we
care about length of the buffer, i.e. space terminating zero *is*
counted on input, so let's be consistent and count it on output as well.

The problem has been fixed, apparently.

Previously the help function output in the docker config listed port 80
as the port on which the server would listen for DNS over UDP and TCP.
However that was inconsistent with the first output line where it was
indicated to be port 53. This has now been corrected.

daemon/tls: fix broken compatibility with gnutls 3.3

Closes #438

See merge request knot/knot-resolver!741