Add [[nodiscard]] to algorithms and views #106
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All views are now marked with `[[nodiscard]]`, although some things may have been missed. For algorithms, `[[nodiscard]]` wasn't added to: 1. In place algorithms 2. Algorithms that take an output iterator. 3. `next_permutation` and `prev_permutation`.
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All views are now marked with
[[nodiscard]], although some things may have been missed.For algorithms,
[[nodiscard]]wasn't added to:ostream_iterator<T>(cout).next_permutationandprev_permutation- thein_found_result::foundseems useful, but I wasn't sure if it is useful enough.