BMCOS filename notations

The database is grouped in folders, each folder corresponding to a single polymorph encoded in the folder name as system_polymorph, where 'system' is the name of the material and 'polymorph' is the polymorph label, e.g. 'cryst-b' for beta-polymorph, 'cryst-aH' for high-symmetry/temperature alpha-polymorph, 'cryst-x' for purely computational polymorph, 'cryst' is the main polymorph, 'cryst-MA' for medium-accuracy geometry (EDIFFG=1E-4), and so forth. Each folder contains the following files: