float/double check bugfix exported a function for NMTOKEN validation add a

* xmlschemastypes.c: float/double check bugfix
* tree.c include/libxml/tree.h: exported a function for NMTOKEN
  validation
* xmlreader.c: add a TODO for Jody
* relaxng.c: bugfix bugfix bugfix
  found 373 test schemas: 300 success 73 failures
  found 529 test instances: 507 success 10 failures
* result/relaxng/*: updated the results
Daniel
diff --git a/xmlschemastypes.c b/xmlschemastypes.c
index 374eddb..e19391f 100644
--- a/xmlschemastypes.c
+++ b/xmlschemastypes.c
@@ -1193,6 +1193,8 @@
 	    neg = 1;
 	    cur++;
 	}
+	if (cur[0] == 0)
+	    return(1);
 	if ((cur[0] == 'I') && (cur[1] == 'N') && (cur[2] == 'F')) {
 	    cur += 3;
 	    if (*cur != 0)