              The number of faces that have been renamed
          """
          rename_count = 0
          for src, dst in tqdm(filename_mappings, desc="Renaming Faces"):
              if src == dst:
                  logger.debug("Skipping rename of '%s' as destination name is same as souce", src)
                  continue
              old = os.path.join(self._faces.folder, src)
              new = os.path.join(self._faces.folder, dst)
              if os.path.exists(new):
                  # This should never happen, but is a safety measure to prevent deletion of faces
                  # when multiple files have the same hash.
 
</s> remove                 # This should never happen, but is a safety measure to prevent deletion of faces
                # when multiple files have the same hash.
                logger.debug("Skipping renaming to an existing file: (src: '%s', dst: '%s'",
 </s> add                 # Interim add .tmp extension to files that will cause a rename conflict, to
                # process afterwards
                logger.debug("interim renaming file to avoid conflict: (src: '%s', dst: '%s')", </s> remove                 continue
 </s> add                 new = new + ".tmp"
                conflicts.append(new)

              The number of faces that have been renamed
          """
          rename_count = 0
          for src, dst in tqdm(filename_mappings, desc="Renaming Faces"):



              old = os.path.join(self._faces.folder, src)
              new = os.path.join(self._faces.folder, dst)
              if os.path.exists(new):
                  # This should never happen, but is a safety measure to prevent deletion of faces
                  # when multiple files have the same hash.
keep keep keep keep replace replace replace keep keep keep keep keep
 Update extracted faces to use PNG EXIF data (#1123)

Documentation
  - Update Usage.md, align.rst and image.rst
lib.image.py
  - read_image - Remove hash return, add metadata return
  - Remove read_image_hash functions
  - Add read_image_meta functios
  - Replace encode_image_with_hash with encode_image (to store metadata)
  - Add png meta reading and writing functions
  - Update Image Loaders/Savers to handle metadata rather than hashes
lib.training_data
  - Naming updates to remove references to hashes
lib.align.Alignments
  - Add versioning notes
  - Increment alignments version to 2.1
  - Deprecate hashing lookup functions
  - Replace filter_hashes with filter_faces
lib.align.detected_face
  - DetectedFace
    - Remove hash property
    - Add png header data serializing/deserializing functions
  - Mask
    - Add png header data serializing/deserializing functions
  - add update_legacy_png_header function to update png meta data
lib.cli.args - Deprecate alignments files for training
- plugins.train.trainer
  - Update alignments/mask code to read png header data
- scripts.convert
  - Aligned images folder - read data from png headers
- scripts.extract
  - Write png header information and no longer store hash of face
- tools.alignments
  - remove leftover-faces, merge and update-hashes jobs
  - Update jobs to use png meta data rather than hashes
- tools.manual
  - Update extract code to output png meta data and don't store hashes
  - Perform check on launch that tool is not pointing at a faces folder
tools.mask
  - Update to use png meta data
tools.sort
  - Update to use png meta data 
tools/alignments/jobs.py