Release 0.7.4

Release 0.7.4

* Fix build under *BSD
* Detect HAN unicode script
* Implement language detection heuristic for text parts
* Fix time output in history
* Improve piechart coloring
* Fix \r\n conversion in DKIM module (reported by @citrin)
* Try to detect systems with no IPv6 support
* Fix multiple/single values in use settings (reported by @citrin)
*  Rework IP addresses in upstreams:
	- Select ipv4/unix addresses if they exist and use ipv6 for ipv6 only
	    upstreams (since the support of ipv6 is poor in many OSes and
	    environments)
	- Free IP list on upstream destruction
	- Add test cases for addresses selection
	- Allow adding of free form IP addresses to upstreams
* Fix endiannes in lua_radix search (reported by @citrin)
* Soft shutdown should also set wanna_die flag (reported by @citrin)
* Stop use-after-free in event loop termination
* Fix processing of very short messages in DKIM (reported by @citrin)
* Detect systems without shared mutexes
* Fix issues with PTR and MX elements in SPF parser (reported by @citrin)

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