2.1

Release 2.1

* [Conf] Update neural.conf
* [CritFix] Fix dkim verification for multiple headers listed
* [Feature] Add support of uudecode
* [Feature] Allow to explicitly set events backend
* [Feature] Implement configurable limits for SPF lookups
* [Feature] Lua_scanners: Use lua magic for inclusion/exclusion logic
* [Feature] Multimap: Do not check files in office archives
* [Feature] Neural: Add sampling when storing training vectors
* [Feature] SPF: Allow to disable AAAA checks in configuration
* [Feature] Spf: Add limits configuration support
* [Feature] Store etag in cached HTTP maps + better logging
* [Feature] Support segwit BTC addresses, fix LTC verification
* [Feature] Support uuencoding
* [Fix] Add configurable number of threads for OpenBLAS
* [Fix] Add workaround for ragel 7 in hyperscan related maps code
* [Fix] Another fix for numeric urls parsing
* [Fix] Correct EMA time calculations
* [Fix] Do not treat archives as text
* [Fix] Do not use strdup on data extracted from lua
* [Fix] Fix a failure calcuating URL reputation.
* [Fix] Fix crash due to constructors init order
* [Fix] Fix crash on parts with no cd
* [Fix] Fix empty prefilters that require mime structures
* [Fix] Fix event loop creation
* [Fix] Fix issues sending DMARC reports.
* [Fix] Fix misprint
* [Fix] Fix saving of the file maps
* [Fix] Fix size calculations when converting from utf16
* [Fix] Fix support of disable_monitoring in rbl
* [Fix] Fix use-after-free
* [Fix] Fix zip files check to relax requirements
* [Fix] Important hiredis fixes
* [Fix] Lot's of fixes in maps check logic
* [Fix] Lua_tcp: Deal with temporary fails on write
* [Fix] Lua_tcp: Make write errors fatal and rework error handlers
* [Fix] Meta: Filter some more values
* [Fix] Neural: Add protection agains infinities
* [Fix] Oops, fix math.huge invocation
* [Fix] Plug memory leak
* [Fix] Sigh, another email to string fix
* [Fix] Try to fix another ownership race in ssl connection
* [Fix] Uuencode: Fix parsing of corrupted uuencode
* [Fix] lua_scanners - razor rename need_check function
* [Rework] Require CMake 3.9 to work, remove manual lto crap
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