- 
            Introduction of ChangeLog
            and release number increments.
          
- 
            Added BOOST_PHOENIX_VERSION_NUMBER using boost/predef style.
          
- 
            Fixes to bugs #5714 and #5824 are particularly important as they fixed
            silent errors in the processing of some compound expressions with commas.
          
- 
            This could cause output from some user codes to
            change unexpectedly.