tweak SequenceBases blurring behavior
make zoomViews configuration use bp/px scale instead of viewport bp
don't shrink track widgets below the height of their track handle
use the dojo contentpage loading message for tracks
block-based tracks are fast-filling by default
make GC content graphs fixed on a 0-1 scale, fix Quant track scaling
remove stray debugging code
bugfix to quant track updating
bugfixes to quant track updating
more block/track updating bugfixes
more cancellation debugging, this time in workers