Added the ability to manually change the minimum and maximum values of an image.  This feature is contained in a new tab called “Advanced Controls”.  When the image is first loaded, the min and max values from the file’s header are loaded into the max and min slots.  The user can manually change the values and press the “Update” button to update the corresponding image with the new values.  There is also a “Reset” button that will reset the image back to its original max and min values.  The user can also press Enter on the keyboard instead of pressing the “Update” button with the mouse.