…_tracks()

* The generate_cluster_tracks() function did not work with the version without map_array
* A unit test is added to proof this

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…ml to enable related unit test

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…ile and removing tests that are covered elsewhere

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* The unit test before had two time frames containing each a 3d image. Both 3d images contained *all* labels that occur in the full timelapse
* The unit test now has two time frames containing each a 3d image. The 3d image of the first timeframe now does not contain all labels that occur in the full timelapse.

…_cluster_image function

* int(np.max(label_image)) could lead to an index out of bounds error, in case where a single timeframe does not contain all labels of the complete timelapse

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…name generate_cluster_image to generate_cluster_image_new

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… to an numpy array first.

…er then using np.max()