Pygeobase

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- Update classifier for pipy upload

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- Fix cell switch bug
- Update copyright year

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- Allow reading of data in append mode.

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- iter_gp does not longer stop if an IOError occurs in the subclass. It catches
the error warns the user and returns None as the dataset object.

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- Add ``IntervalReadingMixin`` for reading files in bigger chunks based on intervals.

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- change ``resample_data`` interface to get weights directly instead of windowRadius.
- Add ``dtype`` and ``__getitem__`` to ``Image`` class.