Represent all flags by DictOfSeries

David Schäferrequested to merge
dict-of-both into develop

This MR makes our DictOfSeries capable of holding pd.DataFrames as well an introduces its usage for all translators. This can only be merged after https://github.com/palmb/fancy-collections/pull/2 is in and the fancy_collections is bumped to the to-be-released version.

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