Zooming figures export

Fix and RFE for zooming images when exporting / creating figures.

To test:
 - Draw a ROI (rect) on an image and create ROI_Split_Figure in Insight, choosing ROI zoom of E.g. 400%. Check that the ROI zoomed panels are not pixelated.
 - Run Batch_Image_Export script, setting the Zoom parameter to E.g. 300%. Should see that all images are 3x their default size and that the zooming is not pixelated.