Whitespace
Backport panic_action

Seeing as were probably going to end up supporting v2.x.x for a while longer...
Include signal.h
request->proxy_reply may be NULL
Whitespace
Don't use IP_SENDSRCADDR (in sendfromto) if on FreeBSD and the socket were using is bound to a specific IP

FreeBSD is extra pedantic about the use of IP_SENDSRCADDR, and sendmsg will fail with EINVAL if IP_SENDSRCADDR is used with a socket which is bound to something other than INADDR_ANY.
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