Analyzer Superclasses Handle Default Settings

[crantila]

Currently, every analyzer must handle its own settings. This leads to a lot of repetition that isn't necessarily, like in the new RBarChart experimenter.

The superclasses should be able to deal with the assignment of optional settings, and even raising exceptions if required settings aren't present. The only thing subclasses should have to do is check for validity, when relevant.

[crantila]

I'm closing this because nobody cares.