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Bug fixes:
- fall back to interactive renaming if no file name transformation is given
instead of silently doing nothing
- complain if no files to rename are given instead of silently doing nothing
- don't print a traceback on KeyboardInterrupt
- ignore trailing path separators in file names
- fixed recognition of sentence endings and numerals starting sentences as
well as apostrophe treatment in sentence-case transformation
Organisation:
- added setup for generating HTML documentation using Sphinx