More clever handling of images
More clever handling of images

- Instead of reading all the images three times, we can actually use
  list comprehension on the "Images" to calculate Max, Mean and STD...
- Appending the images to an empty image makes it easy to calculate the
  sum of all projections and the mean of the dark images for display at
  the end.
- Writing to the log file during the decision loop should speed up the
  script a tiny bit
- Save output images after we're showing everything to the user should
  make the script to seem to be faster :)

habi/GlobalDiagnostiX,habi/GlobalDiagnostiX,habi/GlobalDiagnostiX