This is an internal file type, where all kinds of calibration data and
related information used in calibration will be organized. Such data is
stored in one binary file to keep all required information together.
The file extension *.calibration is used for those files.
Stored information are the following:
Calibration name.
Calibration dependencies.
Folders in a calibration.
All spectra included into a calibration.
All validation spectra included into a calibration.
