added support for unitcell/spacegroup to mmtf parser
added support for unitcell/spacegroup to mmtf parser

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