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The continuation is called with a Boolean indicating whether the
hypothesis was in the intuitionistic context or not.

Split it up into more logical parts.

- More consistent indentation.
- Mark new subgoals as comments.

This is to avoid confusion with those of selection patterns.

This lemma is similar to `later_ownM`.

This lemma allows one to get the witness out of a later, without having
to use `later_car`, i.e. in a way that works in the on-paper version of
the logic.

Thanks to @Blaisorblade for reporting.

Thanks @jtassaro.

Adding a hint without a database now triggers a deprecation warning in
Coq master (https://github.com/coq/coq/pull/8987).

This closes issue #220.