Flint: Fine tune flat field correction

Now the images displayed in Flint are tagged with a layer kind:

• dark (projection from dark scan)
• flat (projection from flat scan)
• other raw

If the flatfield correction is enable

• a dark is displayed without correction
• a flat is displayed with a dark correction only
• other raw data are displayed with a flatfield correction

The plot title displays the layer kind, and the applied corrections

The tooltip displays the applied corrections and the input data without correction

A double click on the scan id (in the property view open an extra plot window and display the used array)