- improvement: long localized messages are in HTML files instead of $lang

array. This is the case of admin/help and about pages.

- deletion: of unused functions (ts_to_mysqldt, is_image, TN_exists,
  check_date_format, date_convert, get_category_directories,
  get_used_metadata_list, array_remove, pwg_write_debug,
  get_group_restrictions, get_all_group_restrictions, is_group_allowed,
  style_select, deprecated_getAttribute).

- new: many new contextual help pages to replace descriptions previously
  included in pages.

- modification: reorganisation of language files. Deletion of unused
  language keys, alphabetical sort. No faq.lang.php anymore (replaced by
  help.html). Only done for en_UK.iso-8859-1.


git-svn-id: http://piwigo.org/svn/trunk@862 68402e56-0260-453c-a942-63ccdbb3a9ee

admin/user_list.php

@@ -293,6 +293,8 @@ $template->assign_vars(
     'L_RESET' => $lang['reset'],
     'L_DELETE' => $lang['user_delete'],
     'L_DELETE_HINT' => $lang['user_delete_hint'],
+
+    'U_HELP' => PHPWG_ROOT_PATH.'/popuphelp.php?page=user_list',
     
     'F_ADD_ACTION' => $base_url,
     'F_USERNAME' => @$_GET['username'],