Style request thread inbox list.
Style profile listings list like inbox list, change CSS class names and styles.css styles as necessary.
Orange border color for listing requests with unread messages in inbox.
Add a buyer line to inbox requests.

Makes it simple to distinguish between requests for the same book.
Change profile column headings to received and set requests.
Add detail view for request threads with template. Unstyled and not hooked into profile page yet.
Message thread detail view hooked into profile page. Can't add a message to thread yet.