- plugin administration: small fix during activation phase

- plugins: added 3 actions in category_cats.inc.php and 1 event that allow a plugin to decide if insertion to #history occurs
- added a warning in section_init if script_basename() is not index or picture (I think we'll have issues on some servers with this function)
- web service methods categories.getImages, tags.getImages and images.search return now the image comment

git-svn-id: http://piwigo.org/svn/trunk@1880 68402e56-0260-453c-a942-63ccdbb3a9ee

include/functions.inc.php

@@ -413,17 +413,23 @@ function pwg_log($image_id = null, $image_type = null)
 {
   global $conf, $user, $page;
 
+  $do_log = true;
   if (!$conf['log'])
   {
-    return false;
+    $do_log = false;
   }
-
   if (is_admin() and !$conf['history_admin'])
   {
-    return false;
+    $do_log = false;
+  }
+  if ($user['is_the_guest'] and !$conf['history_guest'])
+  {
+    $do_log = false;
   }
 
-  if ($user['is_the_guest'] and !$conf['history_guest'])
+  $do_log = trigger_event('pwg_log_allowed', $do_log, $image_id, $image_type);
+  
+  if (!$do_log)
   {
     return false;
   }