Add expression evaluation to green coffee weights

config/Windows/newbatch.xml

         <label>Green Coffee:</label>
         <sqltablearray columns="2" id="greens">
             <column name="Coffee" delegate="sql" showdata="true" null="true" nulltext="Delete" nulldata="delete" data="0" display="1">SELECT id, name FROM coffees WHERE quantity &lt;&gt; 0 ORDER BY name</column>
-            <column name="Weight" />
+            <column name="Weight" delegate="numeric" />
         </sqltablearray>
         <layout type="horizontal">
             <label>Green Weight:</label>