Rocc

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- Compatible with htimeseries 7.

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- Compatible with htimeseries 6.

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- Compatible with htimeseries 4, which uses aware timestamps.

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- rocc() now returns a list of strings with descriptions of where the
thresholds have been exceeded.
- The default flag is now to not add any flags.
- A bug has been fixed where it would crash if input time series was
empty.

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- Initial release