Add getFilesetId to ImageData
Fix typo
Merge pull request #1153 from bpindelski/imagedata-fsid

Thanks Merging
Indicate type of object in collection.
Add visitor to select siblings.
Select the siblings when an image of a MIF is selected.
Use Set instead of List.
Fix multi-selection and highlight of MIF.
Highlight node when multi-selection happens in tree.
Remove duplicated code to change color of the nodes.
Fix multi-selection issue in data manager tree (see #10855)