added more informations in the libxml2-python package including docs.

* configure.in libxml.spec.in python/Makefile.am python/TODO
  python/generator.py python/libxml2class.txt: added more informations
  in the libxml2-python package including docs. Slightly changed
  the class hierarchy
* python/tests/*: added basic regression tests infrastructure too
Daniel

python/tests/xpath.py

@@ -0,0 +1,21 @@
+#!/usr/bin/python -u
+#
+# this test exercise the XPath basic engine, parser, etc, and
+# allows to detect memory leaks
+#
+import libxml2
+
+doc = libxml2.parseFile("tst.xml")
+print doc
+i = 1000
+while i > 0:
+    doc = libxml2.parseFile("tst.xml")
+    ctxt = doc.xpathNewContext()
+    res = ctxt.xpathEval("//*")
+    doc.freeDoc()
+    i = i -1
+doc = libxml2.parseFile("tst.xml")
+ctxt = doc.xpathNewContext()
+res = ctxt.xpathEval("//*")
+print res
+doc.freeDoc()