TODO

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Stephan's TODO
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* testing for endianness correctly (e.g. while writing)?

Matthew's TODO
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* Move file_map to {filename, fileobj, (filename, offset), (fileobj, offset)
  with suitable change warning
* consider deprecating data_dtype methods for images.
* new data package model
* output_space property for images
* dirty attribute for images
* consider adding io_implementation to images to do I/O