reworked toString method (to match other classes)

src/main/java/it/unibz/inf/isochrone/db/TableEntry.java

@@ -55,7 +55,7 @@ public class TableEntry {
 
 	@Override
 	public String toString() {
-		return tableName + ", " + indexName;
+		return "TableEntry [indexName=" + indexName + ", tableName=" + tableName + "]";
 	}
 
 }