Added NPCMarket class for adding NPC market data from an xml file.
Also provided an xml file of all know NPC orders on eve-central from nov 2011 to april 2012 (crucible release time).
unzip the xml to <server_root>/etc/
and add the command  NPCMarket::CreateNPCMarketFromFile("/etc/npcMarket.xml");  somewhere in the server init code to generate the orders.