• Doc : A somewhat better introduction. The FUNCTION section was moved
  before CONSTANTS and HISTORY since it's more important. And
  'assignation' is really 'assignment', says Ricardo. :)
  
• Fix : The op_info features are now thread safe.
  
• Fix : Segfaults that occured when trying to get the op name during
  global destruction.
  
• Fix : Segfaults and wrong "Unknown error" exceptions that happened
  when dieing in require caused a free callback to fire.
  Thanks Florian Ragwitz for reporting.