• Clarified Net-SSLeay's licensing terms: the module distribution has
  been released under the terms of the Artistic License 2.0 since
  version 1.66; references to other licenses have been removed. Fixes
  RT#106314. Thanks to Kent Fredric for pointing out the ambiguity.
  
• Replace the HTTPS hosts in the external tests (some of which were
  no longer online) with more resilient ones. Closes issue #26.