[Bro-Dev] more set operators? (equality/subset)

[Vern Paxson]

I've implemented the set operators we discussed, and am now developing
test cases.

In the process, I'm finding that it would be handy to have set equality
and subset/superset testing.  These would be (for type equivalence sets):

	s1 == s2  iff  both sets have exactly the same members

	s1 < s2   iff  every element in s1 is in s2, but s2 has some
		       elements not in s1

	analogous <=, >, >=, != operators

These can already be implemented in terms of existing operators
(if I haven't screwed something up):

	s1 == s2  <=>  |s1 & s2| == |s1 | s2|
	s1 < s2   <=>  |s1 & s2| == |s1| && |s1| < |s2|

Any concerns with adding these too?

		Vern