A function to flip images horizontally

[Francois Gould]

Working through the XMA workflow with data from our Excitex system, I ran into a problem making the DLT, which was due to the necessity of flipping the image horizontally (because of the geometric relationship of the II and the camera). A feature to automatically flip all images imported (both calibration images and digitization sequences) would be really helpful.

[Benjamin Knorlein]

fixes #48: When creating a new project, the project can be configured to flip all images horizontally

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