Pycbox

- fix install package (if installing using pip)

Features include:

- directory index
- thumbnail gallery
- highlighting (``source-highlight`` or ``highlight``)
- cache thumbnails and highlights relative to current folder
- configurable root folder
- dockerfile

- fix startup error in debug mode, due to port being a string
- fix startup error in docker container, due to permissions
- fix error when trying to upload into root folder
- fix permission problems in docker container

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