Allow public dashboards

Dashboards can now be marked as publically visible in the user
preferences. The dashboard URL has changed from /user/<name>/dashboard
to /dashboard/<name> because /user/<name> requires being logged in as
<name> or as an admin.

src/root/user.tt

@@ -65,6 +65,14 @@
       </div>
     </div>
 
+    <div class="control-group">
+      <div class="controls">
+        <label class="checkbox">
+          <input type="checkbox" name="publicdashboard" [% IF !create && user.publicdashboard; 'checked="checked"'; END %]/>Public dashboard
+        </label>
+      </div>
+    </div>
+
     [% IF !create || c.check_user_roles('admin') %]
       <div class="control-group">
         <label class="control-label">Roles</label>