Missing status and mother_id in offline reader

I see that some members from the km3net-dataformat data are not yet implemented in km3io. For example, in the list of methods for class Trk, there's the Trk::status which is not implemented in km3io. By the way, I could only figure this out by inspecting the code and not from the documentation (see issue #79 (closed)).

In this particular case, I see that the member is marked as TODO. Is there a problem with its implementation? I see that for other methods there are some issues related to uproot. I could help to implement this.