[Bug #661] Fix bug

Oversized watermark height setting overflow hidden to avoid the need of
scaling when taskarea changes

FEA: ItEr63S03BugFixing

navalplanner-webapp/src/main/webapp/common/css/navalplan_zk.css

@@ -1441,4 +1441,12 @@ display:none;
 
 .filter-more-options .z-groupbox-hl {
     cursor:pointer;
+}
+
+#ganttpanel #timetracker {
+    overflow: hidden;
+}
+
+.second_level_ #watermark .timetracker_column_even {
+    height: 99999px;
 }