Prototype executable exercising the following features:

1. API to register algorithms for C++ and Python
2. Phlex executable
3. Configuration 
   1. Supported language is Jsonnet
   2. Ability to configure which modules are loaded (includes ability to configure which algorithms specified in the module are registered)
   3. Ability to configure a Phlex-provided driver regarding which layers should be emitted
4. Product specification
   1. C++ language type
   2. Global product "name"
   3. Data layer
5. Higher-order functions
   1. Transform (C++, Python)
   2. Observer (C++, Python)
   3. Fold (C++)
   4. Unfold (C++)
6. Access to product information (including data-cell ID) through handles
7. Algorithms that can access multiple data products from the same data layer
8. Python algorithm that can consume a data product produced by a C++ algorithm
9. C++ algorithm that can consume a data product produced by a Python algorithm
10. C++ providers that can emit C++ data products