Changing the name of the user function __parse_models() to __parse_models_pdb()
This is Han's patch https://gna.org/task/download.php?file_id=13250 attached to the task
http://gna.org/task/?7404.
The name of the user function __parse_models() in 'generic_fns/structure/internal.py' has been
changed to __parse_models_pdb(). This function is specific for reading the pdb files.