* error.c include/libxml/xmlerror.h include/libxml/xpath.h
  include/libxml/xpathInternals.h xpath.c: cleaning up XPath
  error reporting that time.
* threads.c: applied the two patches for TLS threads
  on Windows from Jesse Pelton
* parser.c: tiny safety patch for xmlStrPrintf() make sure the
  return is always zero terminated. Should also help detecting
  passing wrong buffer size easilly.
* result/VC/* result/valid/rss.xml.err result/valid/xlink.xml.err:
  updated the results to follow the errors string generated by
  last commit.
Daniel