Applied patch from Torkel Lyng to add Schemas support to the Python

* xmlschemas.c include/libxml/xmlschemas.h python/generator.py
  python/libxml.c python/libxml_wrap.h python/types.c
  python/tests/schema.py python/tests/Makefile.am: Applied patch
  from Torkel Lyng to add Schemas support to the Python bindings
  and extend the schemas error API, registered a new test.
* doc/* elfgcchack.h: rebuilt to regenerate the bindings
Daniel

python/tests/Makefile.am

@@ -32,6 +32,7 @@ PYTESTS=	\
     ctxterror.py\
     readererr.py\
     relaxng.py	\
+    schema.py	\
     thread2.py \
     sync.py \
     tstLastError.py \

python/tests/schema.py

@@ -0,0 +1,52 @@
+#!/usr/bin/python -u
+import libxml2
+import sys
+
+# Memory debug specific
+libxml2.debugMemory(1)
+
+schema="""<?xml version="1.0" encoding="iso-8859-1"?>
+<schema xmlns = "http://www.w3.org/2001/XMLSchema">
+	<element name = "Customer">
+		<complexType>
+			<sequence>
+				<element name = "FirstName" type = "string" />
+				<element name = "MiddleInitial" type = "string" />
+				<element name = "LastName" type = "string" />
+			</sequence>
+			<attribute name = "customerID" type = "integer" />
+		</complexType>
+	</element>
+</schema>"""
+
+instance="""<?xml version="1.0" encoding="iso-8859-1"?>
+<Customer customerID = "24332">
+	<FirstName>Raymond</FirstName>
+	<MiddleInitial>G</MiddleInitial>
+	<LastName>Bayliss</LastName>
+</Customer>	
+"""
+
+ctxt_parser = libxml2.schemaNewMemParserCtxt(schema, len(schema))
+ctxt_schema = ctxt_parser.schemaParse()
+ctxt_valid  = ctxt_schema.schemaNewValidCtxt()
+doc = libxml2.parseDoc(instance)
+ret = doc.schemaValidateDoc(ctxt_valid)
+if ret != 0:
+    print "error doing schema validation"
+    sys.exit(1)
+
+doc.freeDoc()
+del ctxt_parser
+del ctxt_schema
+del ctxt_valid
+libxml2.schemaCleanupTypes()
+
+# Memory debug specific
+libxml2.cleanupParser()
+if libxml2.debugMemory(1) == 0:
+    print "OK"
+else:
+    print "Memory leak %d bytes" % (libxml2.debugMemory(1))
+    libxml2.dumpMemory()
+