Epyc

- Refactored experiment combinators
- Fixed summarisation of non-list-returning experiments

- Some refactoring
- Improved exception-handling
- Fixed integration with JSON persistence

- Changed notebooks to keep lists of results for each point in
their parameter space
- Improved handling of pending results
- Allowed addition of lists of results, and experiments that return
lists of results
- Made all the classes "new style", based on object
- Changed Experiment metadata to use datetime objects
- Added Python datetime <-> ISO datetime string handling to JSON
notebooks
- Improved notebook persistence tests
- Refactored repeated experiments to separate repetition and
summarisation

- Made parameter spaces of a single point work properly
- Re-wrote Experiment to clean up the logic and allow better
repetition

- Test suite skips cluster tests if there isn't one running
- Added repeated experiment combinator
- Removed SQL-backed notebooks for the time being, until finished

- Initial experiment, lab, and notebook implementations
- Cluster labs
- Test suite
- Persistent notebooks to JSON; SQLite outlined but not working