* Each part in rspamd task now can have parent part
* Check for parts distance only for multipart/alternative subparts
* Do not check attachements even if they are text (but attached as file)
* Do not die if write (2) returned ENOSPACE while doing logging, turn on throttling mode instead (1 write try in a second)
* Add ability to turn on debug for specific symbols
* Add ability to configure dns timeouts and dns retransmits in config file
* Many improvements to rspamd test suite: now it CAN be used for testing rspamd functionality
* Write DNS resolver tests
* Fix issues with memory_pool mutexes and with creating of statfiles
- handle '\' characters in lua strings correctly
- fix lua initialization
- avoid of using global lua state (global L)
- fix listen sockets hash to allow multiply workers of same type but on different listen sockets
- fix modules options inserting to allow multiply options of the same name
- fix parsing of lua options
- fix lua rules
* Fix sample config
* Fix compile warnings
* Fix building without lua support
* Fix bugs with nrcpt header parsing and symbols cache loading (by Anton Nekhoroshikh)
