improvement: $page['where'] string replaced by $page['items'].

$page['where'] was an SQL clause used to retrieve pictures in #images
table. $page['items'] is the list of picture ids of the current section.

improvement: function initialize_category replaced by dedicated included PHP
script include/section_init.inc.php. Code was refactored to improve
readibility and maintenability. $page['navigation_bar'] is now build in
category.php instead of initialize_category function. Function check_cat_id
was also replaced by a piece of code in the new file. The file to include to
display thumbnails from category.php is now set in section_init.inc.php
instead of calculated in category.php.

bug fix: the test for rel="up" link for standard HTML navigation links in
category menu was not working with non numeric categories, such as
"favorites".

improvement: function check_login_authorization removed because useless but
in profile.php.


git-svn-id: http://piwigo.org/svn/trunk@1036 68402e56-0260-453c-a942-63ccdbb3a9ee

include/user.inc.php

@@ -59,8 +59,13 @@ if ($conf['apache_authentication'] and isset($_SERVER['REMOTE_USER']))
   $user['is_the_guest'] = false;
 }
 
-$use_cache = (defined('IN_ADMIN') and IN_ADMIN) ? false : true;
-$user = array_merge($user, getuserdata($user['id'], $use_cache));
+$user = array_merge(
+  $user,
+  getuserdata(
+    $user['id'],
+    defined('IN_ADMIN') and IN_ADMIN ? false : true // use cache ?
+    )
+  );
 
 // properties of user guest are found in the configuration
 if ($user['is_the_guest'])