Change comparison of station upgrades to industry

http://www.forum.birth-of-the-empires.de./viewtopic.php?p=32695#p32695

Change the station upgrade comparison from ID to industry points
to ignore the order of the shiplist.
Add string for bases disassembled due to upgrades

Add UPGRADE string for stations disassembled as a result of an upgrade
to distinguish them from regular disassembled stations.