Changed output for keyref-match errors; the target-node will be now

* xmlschemas.c include/libxml/xmlerror.h:
  Changed output for keyref-match errors; the target-node will
  be now reported rather than the scope-node of the keyref
  definition - allowing easier chasing of instance errors.
  This was reported by Guy Fabrice to the mailing list.
  Some initial parsing code for schema redefinitions.
* result/schemas/bug303566_1_1.err
  result/schemas/bug312957_1_0.err: Adapted test results due
  to the keyref changes.
5 files changed