[m-rev.] for review: timestamp.m: fix order-of-eval problem

[Ralph Becket]

We've talked before about adding ordered-conjunction (P && Q).

I'm prepared to do the hacking: is there anything more to it than
transforming

	(P && Q)

into

	(if P' then X1 = X1', ..., Xn = Xn', Q else false)

(which should eventually be optimized back into an ordered conjunction)
where if the Xi are the output non-locals of P then

	P' = P[X1'/X1, ..., Xn'/Xn]

- Ralph
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