Advanced ensemble settings

[sfluegel05]

The good news is that our ensemble is growing. But this also means that we can't expect a user to understand each model and either enable or disable it. Instead, we should focus on the important decisions and hide the rest for advanced users.

Current selection:

How it should look like:

1. No buttons visible when first looking at the page, only some button "Advanced options"
2. If advanced options are activated, group the available models: First, enable/disable lookup, then decide to enable/disable rule-based and NN-based results, then settings for individual models
3. (maybe) even more advanced settings - in theory, we could add an option for a custom weighting of each model, let the user disable inconsistency removal, switch between ensemble strategies and tweak other parameters

[sfluegel05]

The first part has been solved - the selection now looks nicer. Advanced settings are still missing.