tiles.rc: tag which road/wire/rail tiles are "over water"

"over water" means when they decay or are bulldozed, they are replaced
with water instead of rubble/dirt.

git-svn-id: https://micropolis.googlecode.com/svn/trunk/micropolis-java@884 d9718cc8-9f43-0410-858b-315f434eb58c

src/micropolisj/engine/TileSpec.java

@@ -18,6 +18,7 @@ public class TileSpec
 	TileSpec onShutdown;
 	boolean canBurn;
 	boolean canConduct;
+	boolean overWater;
 	boolean zone;
 	public TileSpec owner;
 	public int ownerOffsetX;
@@ -178,6 +179,7 @@ public class TileSpec
 
 		this.canBurn = !getBooleanAttribute("noburn");
 		this.canConduct = getBooleanAttribute("conducts");
+		this.overWater = getBooleanAttribute("overwater");
 		this.zone = getBooleanAttribute("zone");
 	}