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Resolve "Multiple rate-limit clauses are unsupported"

See merge request !2262

(cherry picked from commit 2275630b)

Resolve "underflow in stats channel stale cached RRSIG gauge [ISC-support #14769]"

Closes #1074 and #602

See merge request !2237

When updating the statistics for RRset types, if a header is marked
stale or ancient, the appropriate statistic counters are decremented,
then incremented.

Also fix some out of date comments.

Having the decrement/increment logic in stats makes the code hard
to follow. Remove it here and adjust the unit test. The caller
will be responsible for maintaining the correct increments and
decrements for statistics counters (in the following commit).

The stale RR types are now printed with '#'.  This used to be the
prefix for RR types that were marked ancient, but commit
df507515 changed the meaning.  It is
probably better to keep '#' for stale RR types and introduce a new
prefix for reintroducing ancient type stat counters.

Clarify relationship between ACLs and RPZ

Closes #1110

See merge request !2255

In the ARM section about RPZ, add text explicitly stating that ACLs take
precedence over RPZ to prevent users from expecting RPZ actions to be
applied to queries coming from clients which are not permitted access to
the resolver by ACLs.

Remove DLV validation code

Closes #7

See merge request !2233

- this required modification to the code that generates grammar text for
  the documentation, because the "dnssec-lookaside" option spanned more
  than one line in doc/misc/options, so grepping out only the lines
  marked "// obsolete" didn't remove the whole option.  this commit adds
  an option to cfg_test to print named.conf clauses only if they don't
  have the obsolete, ancient, test-only, or not-yet-implemented flags
  set.

Add PKG_CHECK_VAR and AS_VAR_COPY compat macros (Courtesy of ycflash)

Closes #1182

See merge request !2246

Implement a convenience function for "rndc dumpdb"

See merge request !1967