more work on Relax-NG augmented/updated the regression tests added a

* relaxng.c: more work on Relax-NG
* test/relaxng/* result/relaxng/*: augmented/updated the
  regression tests
* xmlschemastypes.c: added a number of base type definition but not
  the associated checks, those are still TODOs
Daniel
diff --git a/result/relaxng/tutor7_2_4 b/result/relaxng/tutor7_2_4
new file mode 100644
index 0000000..86d3a08
--- /dev/null
+++ b/result/relaxng/tutor7_2_4
@@ -0,0 +1,3 @@
+Internal: no state
+internal error validating list
+./test/relaxng/tutor7_2_4.xml validation generated an internal error