Partial fix for issue #2336
Added validation to folder create/update form
Added validation to properties dialog (issue #2347)
Added validation to permissions form (issue #2349)
Fixed parent/creator in properties dialogs
Fixed group tree functionality due to problems from the new section structure
Darker background for selected folder (issue #2337)
Fixed initialization error when sections are empty (issue #2345)
Added a null pointer guard when getting the tree selection
Replaced the remove perm button image and added tooltip (issue #2338)
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