store the total amount of achievable XPs for a Questgroup in the database instead of calculating it every time (Issue #281)

views/html/users/delete.tpl

@@ -0,0 +1,13 @@
+<div class="moodpic">
+	<img src="<?=$linker->link(array('grafics','questlab.jpg'))?>" />
+</div>
+<ul class="breadcrumbs">
+	<li><a href="<?=$linker->link('index',1)?>"><?=_('Users')?></a></li>
+</ul>
+
+<h1><?=_('Delete user')?></h1>
+<?=sprintf(_('Should the user “%s” (%s) really be deleted?'), $user['username'], $user['email'])?>
+<form method="post">
+	<input type="submit" name="delete" value="<?=_('delete')?>" />
+	<input type="submit" name="not-delete" value="<?=_('cancel')?>" />
+</form>