Release 1.7.1

Release 1.7.1

* [CritFix] Fix lowercase comparison
* [CritFix] Timezone defines seconds WEST UTC not East
* [Feature] Add filename to log format
* [Feature] Add lua rules squeezing
* [Feature] Add related symbols analysis to rspamd_stats
* [Feature] Remove upstream `X-Spam: Yes` header by default
* [Feature] rspamd_stats: Output progress info on STDERR
* [Feature] Whitelist for emails module
* [Fix] Do not allow dependencies on self
* [Fix] Do not cache metric result
* [Fix] Do not trust all issuers as a client certificate
* [Fix] Fix dependencies in lua squeeze
* [Fix] Fix enabling/disabling squeezed rules
* [Fix] Fix enabling/disabling symbols
* [Fix] Fix external dependencies
* [Fix] Fix processing of a single compressed file
* [Fix] Fix some typos
* [Fix] Fix various modules in case of empty message
* [Fix] Handle callbacks that returns table of options
* [Fix] Improve cached action interaction
* [Fix] Make dynamic conf more NaN aware
* [Fix] Never hide actions from WebUI `configuration` tab
* [Project] Implementation of Lua rules squeezing

Signed-off-by: Vsevolod Stakhov <vsevolod@highsecure.ru>