• fix a huge memory leak in transform_file (bug #1314)
  
• make it clear from the docs that output_string returns bytes (bug #8875)
  
• added missing type-casting to fix compile-time warnings (bug #18508)
  
• using call_* instead of perlcall* (perl_ variants are obsolete)
  
• in callbacks, POPs on error before croaking, otherwise it has no
  effect (and we probably leak)
  
• added test case which used to fail (provided in rt #15723)
  
• apply patch for Makefile.PL for non-standard libxslt paths (bug #16224)
  
• fix segfault with registered functions returning nodes
  
• fix leaks in parse_stylesheet
  
• error reporting