various improvements

[jeanslack]

What has changed?

• Changed -s --subfolders to -c --collection on command line .
• Changed subfolders default argument to collection default argument on constructor.
• Changed suffix default argument to outputformat default argument on constructor.
• Update man page.
• Update README.md .
• Made wiki for FFcuesplitter command line and using API from Python.
• Replaced file_cataloger def with FileFinder class + code refactoring.
• Improved Log to File: Now logs to each file destination.
• New FFcuesplitter wiki: https://github.com/jeanslack/FFcuesplitter/wiki
• Cosmetic output: For each file to process, print its path-name as source.