Checked off some Market TODO's.

* Added some market offer constraints: offer creation exhaustion and now checks balance to validate sell offers.
* Fixed the depot updating issue (no longer requires updateDepotItemCount function)
* Can now silence the MarketProtocol messages.
* Few minor market fixes.

modules/game_market/marketprotocol.lua

@@ -2,11 +2,12 @@ MarketProtocol = {}
 
 -- private functions
 
+local silent
 local protocol
 local statistics = runinsandbox('offerstatistic.lua')
 
 local function send(msg)
-  if protocol then
+  if protocol and not silent then
     protocol:send(msg)
   end
 end
@@ -130,6 +131,8 @@ function initProtocol()
   if g_game.isOnline() then
     MarketProtocol.registerProtocol()
   end
+
+  MarketProtocol.silent(false)
 end
 
 function terminateProtocol()
@@ -165,6 +168,10 @@ function MarketProtocol.unregisterProtocol()
   MarketProtocol.updateProtocol(nil)
 end
 
+function MarketProtocol.silent(mode)
+  silent = mode
+end
+
 -- sending protocols
 
 function MarketProtocol.sendMarketLeave()