Extend change_collection tools and begin POST process

This creates tools which should just about allow management of the data.

Another radio button at the top and a lot of javascript management tools will be the next step.

At the top: indicators for whether all Content should be treated the same (and how).

Javascript: track which records have internal data changes; make top radio button trigger matching setting on all Content radio sets (so I only have to process the individuals instead of having overlapping and possibly contradictory settings).