Kid3 3.4.1 released

This bugfix release fixes the wrong marking of ID3v2 Date frames as modified and makes it possible to directly add Date frames with ISO date/time values to files which do not yet have an ID3v2.4.0, M4A or Vorbis tag. For the Windows version, issues with incorrect relative paths in playlists, importing from Discogs and temporary files generated by id3lib were fixed.