added xsd:include support, fixed testSchemas behaviour when a schemas

* include/libxml/schemasInternals.h include/libxml/xmlerror.h
  testSchemas.c xmlschemas.c: added xsd:include support, fixed
  testSchemas behaviour when a schemas failed to parse.
* test/schemas/vdv-* result/schemas/vdv-first5_0_0*: added one
  test for xsd:include from Eric Van der Vlist
Daniel
11 files changed