Save script name and its commit ID to log files

- Removed unnecessary normalization and contrast-stretching functions
  from AnalyizeGrid.py
- Corrected crucial typo in DarkDeleter.py and added some info whether
  we delete files or not
- Normalize image to (default) 256 bit during contrast_stretching in
  DetectWhichImageIsRadiography.py and always use 'bone' colormap.
- Delete resulting .tar.gz file at the end in TarToArchive.py