• Add : The new constant VMG_COMPAT_HASH_DELETE_NOUVAR_VOID evaluates
  to true when "delete $hash{key}" does not call 'delete' uvar
  magic in void context.
  
• Chg : The MAGIC tokens created by this module no longer use the
  mg_private member for storing a "magical" signature.
  
• Fix : Triggering magic in a thread on a variable cloned from the main
  interpreter, and when the wizard already went out of scope,
  will not segfault anymore.
  
• Opt : The pointer table is no longer needed to ensure thread safety.
  The size of the object code is about 8% smaller for threaded
  perls.
  
• Tst : Threads tests will not fail anymore if resources constraints
  prevent the system from creating all the required threads.