[Bug #1242] Don't allow progress end dates superior to the corresponding task end date.

This situation still happened in tasks with completition near to 100% (for
example 99%) and the 'by hours' calculation method.

FEA: ItEr75S04BugFixing

libreplan-webapp/src/main/java/org/libreplan/web/planner/TaskElementAdapter.java

@@ -660,6 +660,13 @@ public class TaskElementAdapter {
                 GanttDate result = calculateLimitDateByHours(advanceHours);
                 if (result == null) {
                     result = calculateLimitDateByPercentage(advancePercentage);
+
+                } else {
+                    GanttDate endDate = toGantt(taskElement.getIntraDayEndDate());
+                    if (result.compareTo(endDate) > 0) {
+                        //don't allow progress bars wider than the task itself
+                        result = endDate;
+                    }
                 }
                 return result;
             }