Exposed targetNamespace for simple/complex types, model groups, attribute

* include/libxml/schemasInternals.h xmlschemas.c:
  Exposed targetNamespace for simple/complex types, model groups,
  attribute groups and notations (reported by Michael Hewarth
  to the mailing list). Added targetNamespace to xmlSchemaType,
  xmlSchemaAttributeGroup and xmlSchemaNotation.
  Tiny cosmetic change to the content model error report output.
* result//all_*.err result//any3_0_0.err result//choice_*.err
  result//list0_0_1.err result//list0_1_1.err: Adapted output
  of regression tests.
diff --git a/result/schemas/choice_2_4.err b/result/schemas/choice_2_4.err
index 200a0a2..3d3af59 100644
--- a/result/schemas/choice_2_4.err
+++ b/result/schemas/choice_2_4.err
@@ -1 +1 @@
-./test/schemas/choice_4.xml:1: element doc: Schemas validity error : Element 'doc': Missing child element(s). Expected is one of 'a', 'b'.
+./test/schemas/choice_4.xml:1: element doc: Schemas validity error : Element 'doc': Missing child element(s). Expected is one of ( a, b ).