* HTMLtree.c tree.c threads.c: hum try to avoid some troubles
  when the library is not initialized and one try to save, the
  locks in threaded env might not been initialized, playing safe
* xmlschemastypes.c: apply patch for hexBinary from Charles Bozeman
* test/schemas/hexbinary_* result/schemas/hexbinary_*: also added
  his tests to the regression suite.
Daniel