basictags cleanup
renamed and added some sections
introduced _fuzzy suffix for filters
added some lines
updated configuration
added brief source descriptions and urls
improved some text and explanations
version 0.1.21

removed personal score multiplier, hardcoded to 2.0 for love and 0.5 for
hate updated default configuration
fixed bug related to empty config settings
only save file if tags changed (don't change modtimes unnecessarily)
improved splitting, filtering, docstrings and some other code