preparing to make testsuite releases along with code source releases fixed

* xstc/Makefile.am README README.tests Makefile.tests Makefile.am:
  preparing to make testsuite releases along with code source releases
* gentest.py testapi.c: fixed a couple of problem introduced by
  the new Schemas support for Readers
* xpath.c: fixed the XPath attribute:: bug #309580, #309864 in a crude
  but simple way.
* xmlschemas.c include/libxml/tree.h: fixed a couple of problems
  raised by the doc builder.
* doc/*: made rebuild
Daniel
diff --git a/xmlschemas.c b/xmlschemas.c
index 28a54d6..afa7010 100644
--- a/xmlschemas.c
+++ b/xmlschemas.c
@@ -24362,8 +24362,8 @@
 /**
  * xmlSchemaSAXPlug:
  * @ctxt:  a schema validation context
- * @saxptr:  a pointer to the original xmlSAXHandlerPtr
- * @dataptr:  a pointer to the original SAX user data pointer
+ * @sax:  a pointer to the original xmlSAXHandlerPtr
+ * @user_data:  a pointer to the original SAX user data pointer
  *
  * Plug a SAX based validation layer in a SAX parsing event flow.
  * The original @saxptr and @dataptr data are replaced by new pointers