some classes no longer inherit from DataAccessWidget (#838)

Joachim Wuttkerequested to merge
j.838b into main

Removed inheritance from DataAccessWidget, except where the job-or-data argument is in the way.

To make further progress on #838 (closed), I will in the next MR remove some functionality, namely the heatmap (Plot2DFrame) will no longer be accessible from JobResultsPresenter. To be restored later (#840 (closed)).

Edited by Joachim Wuttke

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