Add some comments and replace get_post_args with load_post_args

lib/_users/login.tpl

@@ -1,13 +1,14 @@
-%{
-
-if(check_user)
-    echo 'You are logged in as' $logged_user
-if not if (~ $REQUEST_METHOD POST)
-    echo 'Login failed!'
-
-%}
+<h1>User login</h1>
+<br />
+% if(check_user) {
+    You are logged in as: <b>%($logged_user%)</b>
+% }
+% if not {
+%    if (~ $REQUEST_METHOD POST)
+%        echo 'Login failed!'
 <form method="POST">
     User name: <input type="text" name="user_name" /><br />
     User password: <input type="password" name="user_password" /><br />
     <input name="s" type="submit" value="Login" />
 </form>
+% }