Add ability to filter on the Message body, or if text appears any where in the message (Header or Body).

The strings are already translated via our search form
This should close Feature Request # 509443

ChangeLog

@@ -271,6 +271,8 @@ Version 1.5.1 -- CVS
   - Fixed Filters plugin problems with duplicate rule processing and false
     unread message counts (Bug# 676073 and patch #919045).
   - Strip position:absolute style from HTML mails.
+  - Add ability to the Filters plugin to filter on Message Body, or both
+    the Headers and the Message Body.
   
 Version 1.5.0
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