Add another convenience method to easily compare lists.

test/TestFacilities.py

@@ -8,3 +8,6 @@ def load_file(p_filename):
     todofile = TodoFile.TodoFile(p_filename)
     return [Todo.Todo(src) for src in todofile.read()]
 
+def todolist_to_string(p_list):
+    """ Converts a todo list to a single string. """
+    return '\n'.join([str(t) for t in p_list])