Added network_provider column to ItemTable, and ensure it's not displayed in the table widget. Also ensure the widget doesn't display the 'select_item' column, previously named 'delete'.

I've just made the factory use an existing record if already created

It appears that JSONField defaults to empty string

So user is redirected to the correct page after uploading data

Make TabbedPage.name and TabInstance.name SlugFields as they are used in URLs. Also rename TabInstance.view_name to tab_type, which is clearer and paralles the dashboard implementation.

When process_items is called without a request, redirect to data-view (don't try to double guess the tab)

Provide the tab instance to get_context_data, and use that to work out the URL to redirect forms to.

Also added test

Remove outer html from the view and edit page, this is now taken care of by the tabbed page rendering.

-- flow both actions and save 'row' on small screens to be on one line - currently save button falling below field. (have reduced dropdown width on smallest screen only where this was a problem)