• fixed error in synopsis (we do not export anything by default)
  
• a caveat added to the documentation regarding embedding warning
  checks inside another sub (this is for you, ribasushi!!!)
  
• ':no_end_test' now also covers side effects of done_testing, as
  well as END blocks, making it possible to use the warning(s) subs
  without having an end warning test while using done_testing
  (necessary when combining with the 'if' pragma)