[project @ 2001-10-17 11:05:36 by simonpj]

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	Desugar bindings into Rec groups more often
	-------------------------------------------

In rather obscure cases (involving functional dependencies)
it is possible to get an AbsBinds [] [] (no tyvars, no dicts)
which nevertheless has some "dictionary bindings".  These
come out of the typechecker in non-dependency order, so we
need to Rec them just in case.

It turns out to be a bit awkward.  The smallest fix is
to make dsLet always make a Rec; brutal but correct.