Merge pull request Cyan4973#58 from Cyan4973/dev

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Merge pull request Cyan4973#52 from Cyan4973/dev

extra static assert, as suggested by @t-mat

Merge pull request Cyan4973#33 from Cyan4973/dev

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Merge pull request Cyan4973#30 from Cyan4973/dev

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Merge pull request Cyan4973#27 from Cyan4973/dev

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Merge pull request Cyan4973#15 from Cyan4973/dev

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Merge pull request Cyan4973#12 from Cyan4973/dev

xxhsum : can use stdin as input (default)

Merge pull request Cyan4973#8 from Cyan4973/dev

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Merge pull request Cyan4973#5 from Cyan4973/dev

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Merge pull request #1 from Cyan4973/dev

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