[jhc] createInstanceRules

[Samuel Bronson]

Could you please take a look at the type error that happens when you
apply both of the patches from "[jhc] darcs patch: Check that lhs and
rhs have compatible t... (and 1 more)" and then run "perl
regress/regress.prl Kleisli"? (Maybe you'll want to unpull the first
one and instead just print out both types in printRule...)

I'm suspicious of the line:
                Just (n,_) -> foldl EAp (EVar n) (vs ++ map EVar args)
but not sure what it should be...