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The trick of using `Hint Constructors` was found in `ZornsLemma.EnsemblesImplicit` which adds the same hint to the HintDb `sets`.
Also, declare `Schutte_basics.ordinal` as a notation instead of as a definition.
The file theories/ordinals/Schutte/Countable.v provides some theory about countable `Ensemble`. The coq-zorns-lemma package contains very similar results already. This commit tries to use as many results from coq-zorns-lemma as possible, instead of defining them in here. Initial discussion on Zulip: https://coq.zulipchat.com/#narrow/stream/344515-Hydras-.26-Co.2E-universe/topic/Library.20for.20countability.3F/near/341893039 This commit still contains some rough edges: - The lemma `countable_singleton` could be incorporated in coq-zorns-lemma, instead of introducing it here. - In some files we have to use `CountableTypes.foo` instead of mentioning the lemma `foo` directly, because adding `From ZornsLemma Require Import CountableTypes` messes up the scopes. This should be seen as a bug in `ZornsLemma`.
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