add more about job costing, classes

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@2747 57a11ea4-9604-0410-9ed3-97b8803252fd

doc/html/C/projects.html

@@ -1465,8 +1465,14 @@
         might include food, travel and lodging, and thus be spread over
         three different expense accounts.  None-the-less, we want all
         of these entries to be marked as being in the same class.
+        (Alternate names: 'job costing' is the report that's generated,
+        'cost center', 'cost pool', 'pooling')
         Note that classes can be particularly useful when used with
-        budgets.
+        budgets: viz. I set aside $10K in the budget for some activity,
+        then deduct the actual costs.  Note that it should be possible
+        to roll the remainder over to somehere else (!) 
+
+        <p>
         This requires the following:
         <ul>
         <li>place in the engine where split can be marked
@@ -1476,6 +1482,7 @@
         <li>Ability to report by class
         <li>Ability to query by class.
         </ul>
+        </p>
 
         <br>
         <br>