Rnd copy paste develop

To test:
 * Import the same image twice (easier to see)
 * Open one image in the full viewer.
 * Go to the data manager. Select the second image
 * Copy the rendering settings
 * Select the first image. Paste the rendering settings.
 * Thumbnails and image in viewer should be updated.
 * Modify rendering settings in image viewer. Click on the save button.
 * Check that the thumbnail is updated.

--rebased-from #2053