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/all_1_5.err b/result/schemas/all_1_5.err
index 32b64a1..d8ca9a7 100644
--- a/result/schemas/all_1_5.err
+++ b/result/schemas/all_1_5.err
@@ -1 +1 @@
-./test/schemas/all_5.xml:1: element a: Schemas validity error : Element 'a': This element is not expected. Expected is 'c'.
+./test/schemas/all_5.xml:1: element a: Schemas validity error : Element 'a': This element is not expected. Expected is ( c ).