resolve protocol for API operation map about gmxapi

[peterkasson]

Not sure I entirely follow; if you're on track and happy, go for it. Otherwise perhaps walk me through it when we chat?

[eirrgang]

This goes deep into the Context-implementation API, with implications for what plugin development looks like and how well we support various aspects of the execution environment abstraction and API extensibility. Technical design issues include:

• to what degree do we want to tag or type operations and edges to help the puzzle pieces fit together?
• How should a gmxapi WorkElement best be generated for a plugin module?

This is probably a long-term issue targeted for much closer to 1.0, but it may generate or tie together task issues while collecting design conversation. I'll try to represent the ideas and issues more clearly with time.