Issue: Changing Top-Level Forums Creates Orphaned Wikis

When changing the Top-Level forum of a namespace, the forums within that namespace are not modified. Any "Wiki" forums in the previous child list are still considered "Wiki" forums, even though they do not correspond to any namespace.

Fixed for the next build by changing "Wiki" children to "Islands" when performing this action if the child contains threads and disabling the wiki if they do not.