Release 1.6.6

* [CritFix] Add sanity guards for badly broken HTML
* [CritFix] Another errors path handling fix
* [CritFix] Fix ARC chain verification
* [CritFix] Fix crash in milter errors handler
* [Feature] Allow to insert headers into specific position
* [Feature] Allow to receive signing keys from mempool vars
* [Feature] Authentication-Results: support hiding usernames
* [Fix] Another try to deal with #1998
* [Fix] Another try to fix #1998
* [Fix] Better handling of the legacy protocol
* [Fix] Check decoded headers sanity (e.g. by excluding \0)
* [Fix] Deal with nan and inf encoding in json/ucl
* [Fix] Deal with URLs wrapped in [] in text parts
* [Fix] DKIM signing: allow for auth_only to be false
* [Fix] Do not crash on empty subtype
* [Fix] Do not fail rbl plugin when there are no received or emails
* [Fix] Do not skip the last character
* [Fix] Do not try to dereference last character
* [Fix] Do not try to sign unknown domains
* [Fix] Exim Received header protocol parsing
* [Fix] First load selector_map and path_map. And only return false when domain not found if try_fallback is false
* [Fix] Fix bad archive characters stripping
* [Fix] Fix comparision
* [Fix] Fix connecting to a unix socket in rspamadm statconvert
* [Fix] Fix empty headers simple canonicalization
* [Fix] Fix extra hits in PCRE mode for regular expressions
* [Fix] Fix parsing of the per-user script
* [Fix] Fix processing of skip-hashes in fuzzy storage
* [Fix] Fix Redis timeout setup
* [Fix] Fix sanity checks on macro value
* [Fix] Fix text splitting: stack overflow (too many captures)
* [Fix] Fix urls/emails distinguishing found in queries
* [Fix] F-PROT Antivirus: only check return code to determine infection
* [Fix] Metadata exporter: check IP sanity
* [Fix] Multimap: received: filtering of artificial header
* [Fix] Plan new event on HTTP errors
* [Fix] Plug another possible memory leak
* [Fix] Remove hop-by-hop headers in proxy
* [Fix] Sanitize IP in history redis
* [Fix] Setting check_local / check_authed in plugins (#1954)
* [Fix] Settings: avoid checking invalid IP (#1981)
* [Fix] Try harder in passing IPv6 addresses
* [Fix] WebUI: use relative path for savemap (#1943)
* [WebUI] Fix message count in throughput summary (#1724)
* [WebUI] Fix NaNs display on Throughput graph
* [WebUI] Restore passwordless login support (#2003)
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