Search engine redesign, first part :

- new table #search to store search rules associated to a search id.

- search rules are not passed through GET anymore, the search array build in
  search.php is serialized in #search table, so no need to rebuild it in
  function include/functions_category.inc.php::category_initialize

- search array build code is improved (efficiency and layout) in search.php

- SQL related to search is build in a dedicated function
  include/functions::get_sql_search_clause

- direct search author:<...>, date_avalaible:<...>, date_creation:<...>,
  keywords:<...> from picture.php are not available anymore. They will come
  back later, with improvement (new design). Same for date_*:<> in calendar
  calendar category.


git-svn-id: http://piwigo.org/svn/trunk@1008 68402e56-0260-453c-a942-63ccdbb3a9ee

include/constants.php

@@ -60,4 +60,5 @@ define('RATE_TABLE', $prefixeTable.'rate');
 define('USER_CACHE_TABLE', $prefixeTable.'user_cache');
 define('CADDIE_TABLE', $prefixeTable.'caddie');
 define('UPGRADE_TABLE', $prefixeTable.'upgrade');
+define('SEARCH_TABLE', $prefixeTable.'search');
 ?>