Mandatory replay features

[ChrisKeefe]

• [ ] Replay for multiple/disconnected graphs (This probably just needs testing)
• [x] Handle no-provenance nodes
• [ ] Some kind of environment checker/management tool (e.g. diffing installed plugin versions against provenance-captured/required for replay plugins)

[ChrisKeefe]

Nice to have:

• [ ] Sorted methods (with citation numbers)
• [x] Citations dump
• [ ] Software Versions dump