improvement: in category.php, an icon opening a popup display the list of
search rules.
modification: function get_search_array is responsible of search rules
retrieving from database. This function is called from get_sql_search_clause
and from search_rules.php
modification: ability to search multiple authors. Warning: this version of
search tool can't search author names including any blank space.
git-svn-id: http://piwigo.org/svn/trunk@1015 68402e56-0260-453c-a942-63ccdbb3a9ee
