import crystal symmetry from phl or cif files
if cif file not found and input name is a valid COD entry, this function tries to download the file from <http://www.crystallography.net/cif/ http://www.crystallography.net/cif/>
Syntax
cs = crystalSymmetry.load('5000035.cif') % load from cif file
cs = crystalSymmetry.load('copper.phl') % load from phl file
cs = crystalSymmetry.load(5000035) % lookup online