Fix exp editor assigning datasets wrongly when choosing protocol

When creating an iris experiment, training & testing were assigned wrongly (why???)

changed milestone to %Experiment Editor: Fixes

added in-progress label

added blocked and removed in-progress labels

mentioned in commit 215d7623

mentioned in merge request !26 (merged)

mentioned in commit 2b24b0ac

closed via merge request !26 (merged)

mentioned in commit 3329b7a1