Add output bps results by DrSlony
US33: Add user story to userstories.txt
Send user stories to Trello
US33: Add alignment switch

- Create two classes with options to load and save an ImageStack. The idea is that, in the GUI, dialogs extend these classes.
- Add a method to ImageStack to save the image, instead of calling DngWriter directly.
- Add a command line switch to disable auto-alignment.