Improve handling of ATTACH property (URIs)

UI/Templates/SchedulerUI/UIxTaskViewTemplate.wox

@@ -82,7 +82,7 @@
         <!-- attach urls -->
         <md-list-item  ng-repeat="url in ::editor.component.attachUrls">
           <md-icon>link</md-icon>
-          <p><a ng-href="url.value">{{url.value}}</a></p>
+          <p><a ng-href="url.value" target="_new">{{url.value}}</a></p>
         </md-list-item>
         <!-- comment -->
         <md-list-item ng-show="editor.component.comment">