Toggly track-adder buttons.
Merge remote-tracking branch 'upstream/master'
Morning dalliance merge
Track adder layout improvements.
WIP activity indicators.
Support removing track hubs.
Merge remote-tracking branch 'upstream/master'
Hide loader icons while waiting for load-tracking infrastructure.
thub hierarchy and parsing fixes.
Store hub list in session state.
Forked stab-building code for track hubs.
Temporary fix for impossible hub-tracks.
Hierarchical stabs for trackhubs.
Treetable for thubs.
Filter some more top-level stuff out of thub view.
More trackhub options for bigbed tracks.
Merge remote-tracking branch 'upstream/master'
Use new hub-stab interface for newly-added hubs.
Matrix views for trackhub composites.
Started styling matrix track view.