revert previous commit. toprettyxml is not working properly

git-svn-id: svn+ssh://svn.marcochapeau.org/laditools/trunk@204 bfe161da-02ef-4cea-8c43-ae261ea21ac6

lib/laditools/config.py

@@ -16,6 +16,7 @@
 
 import xml.dom
 from xml.dom.minidom import parse, getDOMImplementation
+from xml.dom.ext import PrettyPrint
 
 # Let's make sure we'll place the file in an existing dir
 from os import environ, sep, mkdir
@@ -129,4 +130,4 @@ class config:
     # Use this when you want to write the config file to disk
     def save(self):
         config_file = open(config_filename, 'w')
-        config_file.write(self.doc.toprettyxml())
+        PrettyPrint(self.doc, config_file)