Fixed a seg fault in xmlGetQNameProp: a format argument was missing. Fixed

* xmlschemas.c include/libxml/schemasInternals.h
  include/libxml/xmlerror.h: Fixed a seg fault in xmlGetQNameProp:
  a format argument was missing.
  Fixed wrong assignment of the owner of a wildcard in
  xmlSchemaBuildAttributeValidation (in the shorthandform of
  <complexType>; this caused a seg fault, due to a double-free
  of the wildcard.
  Added a check for circular attribute group references.
  Added a check for circular model group definition references.
  Fixed a dublicate xmlParserErrors enum value - see bug #151738.
4 files changed