RandomSample element

[Eddie Kohler]

Hi kids,

I've deprecated the ProbSplitter and RandomLossage elements in favor of a
new element, RandomSample. Here is an equivalence table:

    RandomLossage(P) == ProbSplitter(P) == RandomSample(DROP P) ==
		     RandomSample(1 - P).

For example,

    RandomLossage(0.2) == ProbSplitter(0.2) == RandomSample(DROP 0.2)
			== RandomSample(0.8).

love,
ed