cleanup
removed name filter from config, always active now
remove config and cache args, hardcoded now
fix bug with fetching mbrainz artist data
improve verbose/debug output
catch Discogs SSLError that occurs sometimes
proper handling of tags with 0 as count
improve some text
small improvements
version bump to 0.1.25

change summary:
* nicer and more informative output
* preserve file modification times
* discogs now requires authentication and is disabled by default
* automerge tags from multiple results for nonimportant sources instead of use interactivity
* improve documentation, caching, filters, logging and performance
* other improvements/rewrites/adjustments/bugfixes (see commits for details)