Support changing images on-the-fly
Created originally on Bitbucket by Houzéfa Abbasbhay
Was already merged in Bitbucket before import, marked as merged by the import user
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This pull request contains:
- Support for changing images on-the-fly. Placeholder images have to be inserted in the template to determine the size, position, borders, etc; those the name of which starts with "py3o." are then replaced. New public methods have been added: set_image_path and set_image_data.
- Code formatting - passes PEP8.
- Documentation improvements.