[Jdo Wiki] Update of "ChangeLog" by CraigRussell

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The following page has been changed by CraigRussell:
http://wiki.apache.org/jdo/ChangeLog

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   1. Clarify 18.15.8 that the ordering field should be managed by the implementation, not by the user.
  
   1. Remove the "serialized" attribute from 18.15.8 since the ordering column is not serialized.
+ 
+  1. Add property {{{CopyOnAttach}}} to {{{PersistenceManager}}} and {{{PersistenceManagerFactory}}}. With the property set to true, makes a copy of the detached instance on {{{makePersistent}}}. If the property is set to false, it attaches the detached instance itself.
+ 
+  1. Add {{{ObjectState}}} enum and convenience methods in {{{JDOHelper}}} to return the {{{ObjectState}}} of an instance.
  
  == ACCEPTED ==