new "value" column attribute (same behavior as tag body, but doesn't coerce 
value to string)
--------------------------------------------------------------------------------------------

         Key: DISPL-279
         URL: http://jira.codehaus.org/browse/DISPL-279
     Project: DisplayTag
        Type: Improvement

  Components: Tag Library  
    Versions: 1.0    
    Reporter: fabrizio giustina
     Fix For: 1.1


For a better use of formatting and total sometime we need to set a value in 
column body but without having it converted to String.
We will introduce a new column attribute "value" for this:

The following are equivalent, but the second one will not convert the variable 
"something" to a String:

<display:column>
  <%=something%>
</display:column>

<display:column value="<%=something%>">

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