Development notes

Descriptions for available nodes (with possible lazy evaluation of configuration queries)

Function registration without function names
- Implement basic facility
- Figure out how to handle folds
- Implement tests that mandate an explicit name if the same function is registered twice
Add react_to(...) and produces(...) blurbs for all inputs/outputs that are products?
- What about react_to_many? Is there a react_to_many?
Replicated modules
- Implement basic facility
- Incorporate as part of framework_graph
Convert serial_node to work with framework_graph
Product-lookup policies
Error-detection for nodes with unassigned input ports (it this possible?)
Creating paths (subgraphs)
Backwards compatibility of existing art modules

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