Improve assert message in scrOrderGroupLoc when an order goes out of map bounds.

git-svn-id: https://warzone2100.svn.sourceforge.net/svnroot/warzone2100/trunk@6984 4a71c877-e1ca-e34f-864e-861f7616d084

src/scriptai.c

@@ -433,8 +433,7 @@ BOOL scrOrderGroupLoc(void)
 	 || y < 0
 	 || y > world_coord(mapHeight))
 	{
-		ASSERT( false,
-			"scrOrderGroupLoc: Invalid location" );
+		ASSERT(false, "Invalid map location (%d, %d), max is (%d, %d)", x, y, world_coord(mapWidth), world_coord(mapHeight));
 		return false;
 	}