- 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

feed.php

@@ -214,18 +214,6 @@ function explode_mysqldt($mysqldt)
   return $date;
 }
 
-/**
- * creates a MySQL datetime format (2005-07-14 23:01:37) from a Unix
- * timestamp (number of seconds since 1970-01-01 00:00:00 GMT)
- *
- * @param int unix timestamp
- * @return string mysql datetime format
- */
-function ts_to_mysqldt($ts)
-{
-  return date('Y-m-d H:i:s', $ts);
-}
-
 /**
  * creates a Unix timestamp (number of seconds since 1970-01-01 00:00:00
  * GMT) from a MySQL datetime format (2005-07-14 23:01:37)