- checkbox for "remember me" are only shown if authorized

- simplification : each session is created with a cookie and if
  PhpWebGallery can't read the cookie, it uses the URI id and it will be
  used in the add_session_id function.

- configuration parameter "auth_method" disappeared (didn't lived much...)

- only one session id size possible. More comments for configuration in
  include/config.inc.php


git-svn-id: http://piwigo.org/svn/trunk@555 68402e56-0260-453c-a942-63ccdbb3a9ee

include/config.inc.php

@@ -96,9 +96,11 @@ $conf['remember_me_length'] = 31536000;
 // time of validity for normal session, in seconds.
 $conf['session_length'] = 3600;
 
-// session id length when session id in URI
-$conf['session_id_size_URI'] = 4;
-
-// session id length when session id in cookie
-$conf['session_id_size_cookie'] = 50;
+// session id size. A session identifier is compound of alphanumeric
+// characters and is case sensitive. Each character is among 62
+// possibilities. The number of possible sessions is
+// 62^$conf['session_id_size'].
+// 62^5  =             916,132,832
+// 62^10 = 839,299,365,868,340,224
+$conf['session_id_size'] = 10;
 ?>