Improve naming of the loaded label nodes

[fedorov]

from Steve:

Yes, the convention is SeriesNumber: SeriesDescription (like "3: Ax T1"). Might make sense to do this for all DICOM plugins as a default so maybe some of this code should be a helper method in the DICOMPlugin superclass.

https://github.com/Slicer/Slicer/blob/master/Modules/Scripted/DICOMPlugins/DICOMScalarVolumePlugin.py#L66-L80

[fedorov]

A related effort that was essentially "killed" that should be considered if and when we get to this issue: https://github.com/Slicer/Slicer/pull/527

[che85]

@fedorov Maybe this could also be interesting for the project week?

[fedorov]

Yes, maybe. I am not sure though if the default series number + description will work in all cases. Depending on the user expectations, it might help to include the loadable type in the name. I am not sure there is a universal solution.

[lassoan]

We may update MRML node combo box to display patient/study/series information.

Also, @cpinter has implemented a new node selector (qMRMLSubjectHierarchyComboBox) that allows you to select a node from the subject hierarchy tree. After some further testing and tuning we can replace qMRMLNodeComboBox with this (we can keep the same interface, so nothing else would not need to be changed).