Simplifying refactors

[SU-trash]

• Remove findExisting as all callers had Path values to call one-liner globs with anyway.
• Split parseStoryId into two functions as its behaviour was completely dependent on a boolean flag.
• Simplify manage.py clean and make it default to both (or accept ui or dump)
• Also make extract.py only mention skipped files in verbose mode, as eventually almost all files will already be extracted.
• Reduce indentation levels on large functions
• minor style cleanups