This commit converts the license handling to adhere to the REUSE
specification. It specifically:
1. Adds used licnses to LICENSES/ directory
2. Add "isc" template for adding the copyright boilerplate
3. Changes all source files to include copyright and SPDX license
header, this includes all the C sources, documentation, zone files,
configuration files. There are notes in the doc/dev/copyrights file
on how to add correct headers to the new files.
4. Handle the rest that can't be modified via .reuse/dep5 file. The
binary (or otherwise unmodifiable) files could have license places
next to them in <foo>.license file, but this would lead to cluttered
repository and most of the files handled in the .reuse/dep5 file are
system test files.
3821. [contrib] Added a new "mysqldyn" DLZ module with dynamic
update and transaction support. Thanks to Marty
Lee for the contribution. [RT #35656]
3820. [func] The DLZ API doesn't pass the database version to
the lookup() function; this can cause DLZ modules
that allow dynamic updates to mishandle prerequisite
checks. This has been corrected by adding a
'dbversion' field to the dns_clientinfo_t
structure. [RT #35656]
3432. [func] Multiple DLZ databases can now be configured.
DLZ databases are searched in the order configured,
unless set to "search no", in which case a
zone can be configured to be retrieved from a
particular DLZ database by using a "dlz <name>"
option in the zone statement. DLZ databases can
support type "master" and "redirect" zones.
[RT #27597]
