simplify and creole => rougail

tests/flattener_dicos/80container_files_symlink_without_source/00-base.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<creole>
+<rougail>
     <containers> 
         <container name='test' id='23'>
             <file name='file_name' name_type="variable"/>
@@ -16,4 +16,4 @@
         </family>
         <separators/>
     </variables>
-</creole>
+</rougail>