adding privacy default on import or upload

rowers/templates/rower_exportsettings.html

@@ -46,6 +46,14 @@
     <p>
       Click on the icons to establish the connection or to renew the authorization.
     </p>
+    <p>
+      By default, imported workouts are set to have a public URL. However, new workouts can be set to
+      private by default with the following setting:
+      <table>
+	{{ forms.imports_are_private.as_table }}
+	<input type="submit" value="Save">
+      </table>
+      </p>
   </li>
   <li class="grid_4">
       <h2>API Key</h2>