LMDB: increase max readers for all databases (journal, kasp, timers..)

See merge request !1303

keymgr/on-slave-signing: allow printing master serial

See merge request !1305

tests: better debuggability of problematic contrib/net

See merge request !1304

This has 2 consequences:

1) increased size of lock.mdb file (8k -> 80k)
this seems fine since the number of databases is limited for Knot
and independent on number of zones

2) possibly longer linear search in lock table upon txn_begin
however, it depends rather on real number of readers
than on maximum readers limit

Keymgr ed448

Closes #739

See merge request !1302

Systemd integration improvements

Closes #733

See merge request !1301

A fix for tests-extra: ixfr/many_zones.

See merge request !1299

This change solves the issue of undelivered NOTIFY's over UDP when the slave
is under high load with Valgrind. From now, the master, being Knot, will run
under Valgrind as well as the slave.

dnssec: allow optional sha384 for generated CDS

Closes #738

See merge request !1297

distro: add apkg support

See merge request !1298

Change packaging templates distro/pkg/* to use {{ version }}.

Add scripts/make_dev_archive.sh to create dev archives.

Add apkg config: distro/config/apkg.toml

With these changes, apkg can be used to package Knot DNS.

autoreconf: command not found

Can't exec "aclocal": No such file or directory at ...
autoreconf: failed to run aclocal: No such file or directory

error: Libtool library used but 'LIBTOOL' is undefined

Correct owner of answered CNAME from wildcard expansion

Closes #715

See merge request !1295