Discussion Thread Enhancements for Bob's Showcase 1.0.5

• When converting a thread to an item, the reactions will now also be moved over.

Sorry, 1.0.3 had the wrong template.

Updated.

• Better logic for template replacement (so as not to clash with other mods)
• Don't show "Add Item" button to guests

• Removed un-necessary database query

• Schoolboy error - hide first post now works correctly

• Only load updates for posts on current page.
• Added index for item_id & discussion_post_id.
• Renamed template incase it clashes with a future Showcase update.