• Add : You can now get in all the callbacks either the name or a B::OP
  object representing the current op if you pass the new 'op_info'
  option to wizard() with respective values VMG_OP_INFO_NAME and
  VMG_OP_INFO_OBJECT.
  
• Doc : Document magic on array/hashes values.
  
• Fix : Completely skip free callbacks during global destruction.
  
• Tst : Tests now pass again on 5.8.3 and lower (they were broken since
  0.27).
  
• Tst : Test magic on symbol table and on array/hash values.