Bank withdrawals and deposits are now all logged
Mudmail changed to make it easier to send mail in-game
Courier imp removed and auction bids now require prepayment from bank

- Courier imp removed from game
- Bidding an amount takes directly from bank accounts
- Money is refunded to losers of auction
- Notification and item delivery done through mail system
Manually merged branch 'auctioneer-rewrite'

Conflicts:
	src/specials/Specs/mobile_specs/auctioneer.c