/** Undoes the changes of the person edit */
public void undo() {
allocation.startDate = oldStartDate;
allocation.endDate = oldEndDate;
Collections.sort(allocation.getProject().getTeamAllocations());
}
/** Executes/Redoes the changes of the allocation edit */
public void execute() {
allocation.startDate = startDate;
allocation.endDate = endDate;
Collections.sort(allocation.getProject().getTeamAllocations());
}