Filter to remove extra white space within the text.

• author: Converted to a Savant3 filter by Paul M. Jones <pmjones@ciaweb.net>
• author: Monte Ohrt <monte@ispi.net>
• author: Contributions from Lars Noschinski <lars@usenet.noschinski.de>
• version: $Id: Savant3_Filter_trimwhitespace.php,v 1.4 2005/05/29 15:27:07 pmjones Exp $
• license: LGPL