Currently, desktop and mobile are accessing the DownloadThread
and the DiveImportedModel concurrently. This makes a big data
flow mess. To achieve a more hierarchical data flow, start
by making the DownloadThread a subobject of DiveImportedModel.
Start the download by calling a function in DiveImportedModel.
Route the finished signal through DiveImportedModel. Thus,
the model can reload itself with the new data.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
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