Merge branch 'master' into structure-data-model

docs/cif-schemas.md

src/reader/cif/data-model.ts

src/reader/cif/index.ts

src/reader/cif/schema.ts

src/reader/cif/schema/dic.ts

src/reader/cif/schema/mmcif.ts

src/reader/cif/schema/utils.ts

src/reader/cif/text/parser.ts

src/reader/spec/cif.spec.ts

src/script.ts