Post check v1.5 changes: Added 'deleteorphanedposts' function.
Post check v1.4 changes: Now checks post has valid data in three associated tables.
Post check v1.3 changes: New version now reports on post errors only.
Post check v1.2 changes: Added option to check for valid user_id's in posts.
Post check v1.1 changes: Removed PHP code which was not needed.
