Update Iter.ml to use mutable fields instead of refs #44
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In MList,
type 'a node = Nil | Cons of 'a array * int ref * 'a node ref
was changed totype 'a node = Nil | Cons of { a : 'a array; mutable n : int; mutable tl : 'a node }
and all functions in MList were updated accordingly. This should hopefully make MList be a little faster (less indirection needed) and use less memory.