Make hash table have comparison callback, it's needed.

	Make hash table have comparison callback, it's needed.

	Update dict.c, request_list.c, rlm_files.c, and rlm_detail.c
	to use updated API.

	Move hash definitions to src/include/hash.h.

	Add src/lib/packet.c, to have more code re-use between various
	programs that need to send more than one RADIUS packet.

	Updated listener code in radiusd && radclient to use new packet
	routines.  It's not complete yet, but the amount of duplicate
	code is going down, and what's left is getting easier to understand.