wip on hierarchical tracksel
style the hierarchical track sel
factor simple tracklist text filtering into a mixin, add it to Hierarchical track sel
update release notes
make hierarchical track sel the default
add --metadata arg to bam-to-json.pl
add `--metadata` arg to `flatfile-to-json.pl`
sort undefined categories in track meta store as if they were literally "Uncategorized"
categorize most of the volvox example tracks