comparative analysis table fields not accessible via `fields` when filtering on a different dataset

[cmatKhan]

when querying harbison, it should be possible to add DTO fields via the fields argument to query.

In fact, need to think about how th ecomparative analysis eg perturbation_id is parsed out -- how to make it easy to say, give me all records in harbison. and then with result, group by hackett

[cmatKhan]

When filteirng on a field, i tshould at least return that field, eg when filtering on dto_empirical_pvalue, at least dto_empirical_pvalue should be returned

[cmatKhan]

What about filtering on harbison and hackett? eg I want to filter by dto_empirical_pvalue between harbison and hackett? is that best if done by specifying the dataset?