[calib2] Allow to create a json file

[vallsv]

The calibration software should allow to create an output file that can be used by the integration software without much configuration

[vallsv]

This could be done using the integration dialog.
But it is maybe better to create a new view for it.
Especially to be able to specify a data image which is not the one it was used to calibrate the detector.

It is a more easy task than creating a unique application for calibration and integration, cause here it is not designed the integrate the result, but only to create the configuration file (btw the data to integrate are not part of the json integration file).