32 bit

Add support for  32-bits images (pixels type)
 * Import the following images. 
    * test_image_good/ubm
    * from skyking/gatan/chip/
   * from skyking/gatan/qa-7642
 * Check that you can view the images.
 * Open the images in ImageJ or Fiji using BioFormats to validate.

Images imported w/o this PR can be found under 
trout/ port 14064 (latest), user-1 private-1 Project imported 18-08-14 to test 32 bit