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This is essentially a "squashed commit" of PR #139 plus some other features that round out the work I've done to improve the demo-ability and user-friendliness of the ITR tool. The previous PR trues up the units and unit-handling of the ITR tool, but without any other user-visible (or user-helpful) changes. This has all that (because new sample data doesn't work with the previous version), but also tidies up warnings and errors to make the tool more friendly. If this PR is merged into develop, then 139 should be dropped.