Increased test coverage for all collection classes up to the priority queue to 100%; SetParent() is no longer 'protected internal' as internal is sufficient in this case (.NET 'protected internal' is less restrictive than 'protected' or 'internal' alone); parenting collection now unsets parent for items that are being replaced; priority queue version check for enumerators (to protected against modification of the collection) now only happens in debug mode

git-svn-id: file:///srv/devel/repo-conversion/nusu@94 d2e56fa2-650e-0410-a79f-9358c0239efd

Source/Collections/ParentingCollection.cs

@@ -73,6 +73,7 @@ namespace Nuclex.Support.Collections {
     /// <param name="index">Index of the element that was assigned</param>
     /// <param name="item">New item</param>
     protected override void SetItem(int index, ItemType item) {
+      base[index].SetParent(default(ParentType));
       base.SetItem(index, item);
       item.SetParent(this.parent);
     }