adding preffereddate to session and tooltip on workout

rowers/templates/plannedsessionview.html

@@ -92,9 +92,12 @@
     <tr>
           <td> {{ workout.date|date:"Y-m-d" }} </td>
           <td>
+            <div class="tooltip">
             <a href={% url manager.defaultlandingpage id=workout.id %}>
               {{ workout.name }}
             </a>
+            <span class="tooltiptext">{{ workout.notes }}</span>
+            </div>
           </td>
           <td> {{ workout.distance }}m</td>
           <td> {{ workout.duration |durationprint:"%H:%M:%S.%f" }} </td>