Updated views.py - pre-order button only appears if listing's status is 'Open for Bidding', and buyer can only place order if their balance in their Bankaccount is higher than the price. The total cost is taken from the user's Bankaccount and added to the listing's escrow.
Updated models.py
Updated detail.html - made pre-order button visible only if listing is open for bidding
Updated checkout.html - added error message
Updated profile_buyer.html - fixed small bug involving user
Updated profile_seller.html
Updated admin.py - Orders are now displayed
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Merge remote-tracking branch 'origin/master'