... and perform extra checks when converting from the floating-point
number.

Fixes #160.

Some of their nameservers return 192.168.1.1, but it seems an
improvement, as meaningful address is returned sometimes now.

Fixes https://gitlab.labs.nic.cz/knot/resolver/issues/160

Disable storing GLUE records into the cache in the QUERY_PERMISSIVE mode

See merge request !208

layer/iterate: some improvements in cname chain unrolling

See merge request !207

lib/resolve: zonecut fetching error was fixed

See merge request !205

including code to deal with #128 and #140.

All either generated by the build system or some "standard tools".

trust anchor fixes

Closes #151

See merge request !193

- Remove abstraction of the refresh callback, as we always use the same
  function.  This way the code is significantly easier to understand.
- Add a couple more comments.

It was strange to keep it indefinitely, and the code was already
half-prepared for this change.  Theoretically, if a resolver has been
stopped for too long to miss a key's period of Revoked status, it would
continue to trust the key forever.

- The description was very misleading (far from reality).
- The removed condition in rrcache was bogus.

- printing refresh time in milliseconds could've been confusing;
- move syntactic sugar definitions close to the rest of the table;

... via trust_anchors.{bootstrap_url,bootstrap_ca}

Latest version of Deckard provides script kresd_run.sh which executes
all the tests twice:
- without query name minimization
- with query name minimization

Let's use this for CI!

- docs: fix cache.current_* since long ago d5272b4b
- don't allow "cache.foo = 'bar'" for abitrary foo
- restore cache['nic.cz'] after b31bad2ccf while not breaking completion
- #cache won't work on lua 5.1, so remove it

Fix -k argument processing to avoid out-of-bounds memory accesses

See merge request !195

Mangling of keyfile_dir and allocation of keyfile_path led to rare
crashes (and Valgrind complaints).

The error was introduced in 21f3a6b9.