Changes to the search code

- Add a configurable flood control limit to searching
- Change the way old search results are removed to deal with an issue with mysql 5 crashing on large queries
Note to translators: This adds new language variables
Note to designers: This changes a template file
There are also database changes assosciated with this change, these will follow later


git-svn-id: file:///svn/phpbb/branches/phpBB-2_0_0@5528 89ea8834-ac86-4346-8a33-228a782c2dd0

phpBB/language/lang_english/lang_admin.php

@@ -341,6 +341,10 @@ $lang['Allow_autologin_explain'] = 'Determines whether users are allowed to sele
 $lang['Autologin_time'] = 'Automatic login key expiry';
 $lang['Autologin_time_explain'] = 'How long a autologin key is valid for in days if the user does not visit the board. Set to zero to disable expiry.';
 
+// Search Flood Control - added 2.0.20
+$lang['Search_Flood_Interval'] = 'Search Flood Interval';
+$lang['Search_Flood_Interval_explain'] = 'Number of seconds a user must wait between search requests'; 
+
 //
 // Forum Management
 //

phpBB/language/lang_english/lang_main.php

@@ -784,6 +784,7 @@ $lang['No_searchable_forums'] = 'You do not have permissions to search any forum
 $lang['No_search_match'] = 'No topics or posts met your search criteria';
 $lang['Found_search_match'] = 'Search found %d match'; // eg. Search found 1 match
 $lang['Found_search_matches'] = 'Search found %d matches'; // eg. Search found 24 matches
+$lang['Search_Flood_Error'] = 'You cannot make another search so soon after your last; please try again in a short while.';
 
 $lang['Close_window'] = 'Close Window';