* relaxng.c xmlschemastypes.c: more work on XML Schemas datatypes
  and facets support. Currently only schemas with binHex or
  base64 don't compile. A few error left in the test suite:
  found 1035 test instances: 919 success 23 failures
  most are gdate or gdateyear failing check, and a few cases where
  James clark tests results are strange.
* valid.c: allow to reuse the Notation checking routine without
  having a validation context.
* SAX.c: removed a #if 0
Daniel