Add magic to replace the xml package with _xmlplus at import time.

Update docstring to reflect change of name for the parsers subpackage.

Lib/xml/__init__.py

@@ -5,9 +5,19 @@ This package contains three sub-packages:
 dom -- The W3C Document Object Model.  This supports DOM Level 1 +
        Namespaces.
 
-parser -- Python wrappers for XML parsers (currently only supports Expat).
+parsers -- Python wrappers for XML parsers (currently only supports Expat).
 
 sax -- The Simple API for XML, developed by XML-Dev, led by David
        Megginson and ported to Python by Lars Marius Garshol.  This 
        supports the SAX 2 API.
 """
+
+
+if __name__ == "xml":
+    try:
+        import _xmlplus
+    except ImportError:
+        pass
+    else:
+        import sys
+        sys.modules[__name__] = _xmlplus