Updated models.py - added statuses to Listing and Order
Updated views.py - added withdrawListing function, made smallall changes to other functions
Updated admin.py - made sure it doesn't display extra fields
Updated urls.py - added url for withdraw listing page
Updated profile_buyer.html - displays date withdrawn/aborted
Updated detail.html - displays withdraw button for seller
Added withdraw_listing.html - basic template for withdraw listing page
Updated withdraw.html - tiny change