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

python/libxml2class.txt

@@ -1066,7 +1066,9 @@ Class xmlTextReader(xmlTextReaderCore)
     ReadString()
     RelaxNGSetSchema()
     RelaxNGValidate()
+    SchemaValidate()
     SetParserProp()
+    SetSchema()
     Standalone()
     String()
     Value()
@@ -1080,6 +1082,9 @@ Class xmlEntity(xmlNode)
     handleEntity()
 Class Schema()
 
+    # functions from module xmlreader
+    SetSchema()
+
     # functions from module xmlschemas
     schemaDump()
     schemaNewValidCtxt()
@@ -1120,6 +1125,7 @@ Class inputBuffer(ioReadWrapper)
 Class SchemaValidCtxt(SchemaValidCtxtCore)
 
     # functions from module xmlschemas
+    schemaIsValid()
     schemaSetValidOptions()
     schemaValidCtxtGetOptions()
     schemaValidateDoc()