Dataset blocks should hide/show the same as other blocks

Dataset blocks always exist at the bottom of the exp editor - they should only pop up if you click a dataset block. But if you click one dataset block, all of them should pop up

changed title from Dataset block aren't treated the same as other blocks to Dataset blocks should hide/show the same as other blocks

added medium label

added easy and removed medium labels

changed milestone to %Experiment Editor: Fixes

added in-progress label

mentioned in commit 687b1f4d

added blocked and removed in-progress labels

mentioned in merge request !26 (merged)

mentioned in commit 4fd01ccb

closed via commit 4fd01ccb

mentioned in commit 3329b7a1

closed via merge request !26 (merged)