Calibration GUI

[joaofayad]

The Calibration GUI is running in a non-intuitive way. Background is only removed for detection of the calibration object if the "Display background" option is ticked off.

Split-line display may be broken.

For some matlab versions checking for VIdeoReader input type is also broken.

Improve user friendliness by:

• Disabling irrelevant GUI options if no video is present.
• Enable GUI resizing
• Chage "Display backgournd" to "Use background" to be clear about the effect of the option. Consider if supporting detections without removing the background make sense.

[DennisEckmeier]

I suggest the calibration to always work on the background-subtracted data, and the 'display background' to change to 'subtract background' (reversed functionality and only for display).