Force lowercase username, remove from session

templates/base.html

@@ -10,7 +10,7 @@
 		<a class=logo href="{{ url_for('index') }}">A</a>
 		<div style="margin:auto"></div>
 		{% if 'user_id' in session %}
-		<a href="{{ url_for('user_edit') }}">{{ session.get('username', '???') }}</a>
+		<a href="{{ url_for('user_edit') }}">User panel</a>
 		<span>|</span>
 		<a href="{{ url_for('logout') }}">Logout</a>
 		{% else %}