Fix vendor price while vendor is buying items

This reverts commit 19fb79656f3789ef8ce87b62c47ba3e7b277345f
Merge pull request #279 from dlowe-net/fix-vendor-buy-price

Fix vendor price while vendor is buying items
Fix cast type of money_t in list_commission_item()
Merge pull request #292 from mikeclemson/fix-artisan-money-casting

Fix cast type of money_t in list_commission_item()
Calm spell is now a room effect usable by good knights
Added spell message for room
Properly handle rooms that have multiple affs
Merge pull request #282 from mikeclemson/make-knight-calm-room-affect

Make knight calm room affect