Phenopype

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new major release - breaks all existing versions

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bugfix:
- add_files with multiple ex- or include argument created duplicated filelists

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- New feature: scale (former scale_maker) can now automatically equalize histograms via interpolation. Was mostly inspired by this SO question: https://stackoverflow.com/questions/32655686/histogram-matching-of-two-images-in-python-2-x
- renamed "scale_maker" method to "scale", and subfunctions, too. tutorials updated. more name changes to come towards a more intuitive naming convention
- show_img can now show multiple images when list is provided
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- scale_maker is completely reworked: now has zoom and onscreen notifications for mm/pixel info. measuring scale and making a template for detection are now two separate functions (measure_scale and make_scale_template)
- documentation and API reference for tracking module added
- test for scale added

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- landmark_maker has now (limited) mousewheel zooming functionality
- changed instructions for phenopype installation: make virtual env in conda for better package control (e.g. avoid different opencv versions)

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bugfix:
- "filename not found" when no objects were found