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Previously isc_mem_t and isc_mempool_t had public header with magic
and matching full private types isc__mem_t and isc__mempool_t to
support non-BIND 9 API.  With turning the API to private to BIND 9, we
can make isc_mem_t and isc_mempool_t opaque data types and remove the
retyping from isc_mem_t to isc__mem_t in every call to isc_mem and
isc_mempool APIs.

The only memory context flag left was memory fill option, and
that was globally set anyway (except for tests).  This commit
removes the ability to have per memory context flags and only
keeps the ability to turn the ISC_MEMFLAGS_FILL on or off on
a global level.

The isc_mem and isc_mempool API had ability to override various memory
methods (memalloc, memfree, ...).  The ability has been removed and
one level of indirection on every call to malloc/free and others has
been removed.

Extend the isc__mem_t structure to have per thread counters to reduce
memory contention under normal operation, and only sum the counters in
the stats.

The per thread table is static (128 entries), so when BIND is running on
a machine with more than 128 cores, the structures can be shared between
some threads (simple modulo is used to distribute the load).

The shared accounting resources in the isc__mem_t structure have
been previously protected by a mutex and they are not protected
by C11 stdatomics.

update README to explain gitlab numbers

See merge request !1946

Resolve "socket.c error 'SO_REUSEPORT' undeclared"

Closes #1003

See merge request !1884

Add most useful relaxed and acquire-relase stdatomic convenience macros

See merge request !1935

The header file <isc/atomic.h> now contains convenience macros for
most useful explicit memory ordering for C11 stdatomics, only relaxed
and acquire-release semantics is being used.  These macros SHOULD be
used instead of atomic_<func>_explicit functions.

Remove UNSPEC rrtype

Closes #899

See merge request !1931

Resolve "armv5 build is broken"

Closes #981

See merge request !1892

Resolve "Remove dead code in pkcs11-keygen.c"

Closes #984

See merge request !1814

Add benchmark for isc_{mem,mempool}_{get,put} operations

Closes #713

See merge request !1928

placeholder

See merge request !1923

Make NTAs work with validating forwarders

Closes #997

See merge request !1859

5219.	[bug]		Negative trust anchors did not work with "forward only;"
			to validating resolvers. [GL #997]

If named is configured to perform DNSSEC validation and also forwards
all queries ("forward only;") to validating resolvers, negative trust
anchors do not work properly because the CD bit is not set in queries
sent to the forwarders.  As a result, instead of retrieving bogus DNSSEC
material and making validation decisions based on its configuration,
named is only receiving SERVFAIL responses to queries for bogus data.
Fix by ensuring the CD bit is always set in queries sent to forwarders
if the query name is covered by an NTA.

Improve the error message about missing PLY Python package

Closes #958

See merge request !1918

Previously, only a message about missing Python was printed, which was
misleading to many users.  The new message clearly states that Python
AND PLY is required and prints basic instructions how to install PLY
package.

Make lib/dns/gen.c compatible with reproducible builds.

See merge request !1758

The gen.c will now use SOURCE_DATE_EPOCH[1] if found in environment
to make the build more reproducible build friendly.

1. https://reproducible-builds.org/specs/source-date-epoch/