Mountain-tapir

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* New attempt to include __init__.py in pypi distributions.

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* Fix pypi image to include __init__.py in resources directory.

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* New open image dialog containing preview thumbnails.

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* Add icons for algorithm buttons.
* Minor fix for shuffle for Python 3.

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* Maintain the selected images when changing layout and number of regions.
* Remove support for Python 2.6.
* Fix button to clear recent images.

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* Keep the same images loaded when changing algorithm.
* Playing around with source code to make it look prettier.