changed mmtf url to only use pdbid as filename
changed mmtf url to only use pdbid as filename

fredludlow/ngl,arose/ngl,j0kaso/ngl,arose/ngl,arose/ngl,fredludlow/ngl,arose/ngl,j0kaso/ngl,j0kaso/ngl,fredludlow/ngl,fredludlow/ngl