Change author v3.4 changes: Fixed issue with Latest post not being updated if changing author of last post in the thread.
Change author v3.3 changes: Fixed issue with updating attachment data.
Change author v3.2 changes: Fixed issue with last post information shown in forum view.
Change author v3.1 changes: Now updates thread watch.
Change author v3.0 changes: Fixed issue with properly updating news feed data.
Change author v2.8 changes: Fixed issue with Latest activity not being updated.
Change author v2.7 changes: Fixed issue with changing guest author.
Change author v2.6 changes: Fixed issue with xf_thread_read and xf_thread_user_post counts.
Change author v2.5 changes: Now updates search index and message counts.
Change author v2.4 changes: Fixed issue relating to invalid author username entered in overlay.
