PEAR_PackageUpdate::setDontAskAgain -- 
   Sets the user's "Don't Ask Again" preference for the package.
  
Description
   Sets the user's "Don't Ask Again" preference to
   $dontAsk. If $dontAsk is TRUE
   the user will not be asked to update the package again.
  
Note
   since 0.4.0a1
  
This function can not be called
statically.
Return value
   boolean - TRUE if the preference was set properly, FALSE otherwise.