PaaS deployment - take over Solve API

[nirlipo]

• Look at pending issues https://github.com/AI-Planning/planning-as-a-service/issues
• Integrate with editor.planning.domains
• Mirror the old solver end-point so that an informative error message is provided
• Make sure mysql database is persistent when the system is rebuilt. Currently the make command would rebuild the mysql doker image and flash all the data.
• Make sure the persistent option is exposed
• do a test period coexisting both interfaces to check reliability of the workers, and how do they recover from failure.

[haz]

@nirlipo Shall we use this issue to document the full process to replacing the online editor "Solve" functionality? Old solver should go away entirely.

[nirlipo]

Sounds like a good place to keep track of it, I'll edit the title too for clarity and add more items to the checklist.