Title: Forum Sort_by_Title Issue

Still a problem in V5.1. 

Set the local default sort order to Title and the forum gives error message on access. 

While in TW default sort order (Post_Date), clicking to sort by Title, gives an error page (see attached). 

Get the same error for columns: Type(object), Emoticon(object), Title($), Reads(numeric), Author($), Actions(object). 

Works OK for folumn: for: replies(numeric), LastPost(date). 

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S2S
-----twTitleSortErrMsg----- 
An error occured while performing the request.

Things to check:

   1. Did you complete the Tiki Installer?
   2. Is your database corrupt? Please see how to repair your database
   3. Are your database credentials accurate? (username, database name, etc in db/local.php)

Please see the documentation for more information.

-----CommentSubmitErrMsg-----  
Surprise! Error messages on Comment Submit: 

URL: http://dev.tikiwiki.org/tiki-view_tracker_item.php?itemId=2998&trackerId=5&show=view 

ErrorMsg: (white screen)

Warning: require_once(lib/core/lib/DeclFilter.php) [function.require-once]: failed to open stream: No such file or directory in /home/two/dev/tiki-filter-base.php on line 96

Fatal error: require_once() [function.require]: Failed opening required 'lib/core/lib/DeclFilter.php' (include_path='/home/two/dev/lib/pear:.:/usr/share/php:/usr/share/pear:/home/two/dev/lib/core/lib:/home/two/dev/') in /home/two/dev/tiki-filter-base.php on line 96
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