begin reorganizing code for chunk downloading
fix point fill selection
iris linked
test flip
saveChunks writes tsv
build selector inside geom processing
time and chunks
first figure out chunk.cols, then use saveChunks
pointers to related chunks and selectors
TODOs dones
TODO widgets
TODO interactive legends, first selection
consistently named output functions
compile without error
update_geom and draw_geom
download and draw
lines render
loading table
animation works again
duration works again