Make to_dict return copy of content for all music data structures
Make generic browse and make the first 2 of 3 missing MS classes
Completed first version of music service data structures
Wimp: Complete browse function, correctly set parentID, clean up
data_structures: combine didl_metadata for music service items
wimp: Add info about exception on tracks that are listed but not available
Merging wimp and data structure work into upstream master
A few pylint fixes
And flakes fixes
Last pylint fix
Dumb typo
Typos and spelling errors
Grumble, pylint line length settings differences
More small fixes based on review comments in #140
Merge pull request #140 from KennethNielsen/wimp_part2_send_in

Wimp part 2 (browse method), better generalized music service data structures