Rework check_expr substantially.

The bulk of check_expr is now check_expr_with_unifier, which takes an
expected type and a unification function and will perform the
unification on the type it produces. check_expr calls
check_expr_with_unifier with a dummy unifier and a new function,
check_expr_with, takes an expected type and uses the simple unifier.

I think this generally makes thing cleaner, but the purpose for doing
this is to enable type inferred lambda-blocks to be useful by allowing
the argument types to be unified before the body of the lambda is
checked.

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