Added energy

git-svn-id: https://redmine.imt-atlantique.fr/svn/xaal/code/Python/trunk@1993 b32b6428-25c9-4566-ad07-03861ab6144f

apps/dashboard/xaal/dashboard/static/tags/powermeter.tag

 <powermeter>
 
 <span class="powermeter">
-  <span class="power">{ power }&nbsp;W</span>
+  <span if={power} class="power">{ power }&nbsp;W</span><br/>
+  <span if={energy} class="energy">{ energy }&nbsp;kW</span>
 </span>
 
 
 <script>
   this.addr = opts.xaal_addr;
-  this.power = '__';
+  this.power = null;
+  this.energy = null;
   receive(data) {
     this.power = data['attributes']['power'];
+    this.energy = data['attributes']['energy'];
     this.update();
   }
 </script>