Set request.root before rendering page frame.
Calculate hub_url correctly.
Merge branch 'hotfix-trackhubs' into hotfix-v12
Merge tag 'v12.1'

v12.1
Remove modification to experiment test data.
Merging in master.
Incomplete: Adding experiment Jest test.
Basic Jest tests for experiment.js component.
More complete Jest tests of experiment.js, including test data.
Adjust experiment-test.js to make organism selection easier.