structure data model 1st somewhat working version

src/mol-base/collections/_spec/table.spec.ts

src/mol-base/collections/column.ts

src/mol-base/collections/integer/_spec/segmentation.spec.ts

src/mol-base/collections/integer/impl/segmentation.ts

src/mol-base/collections/table.ts

src/mol-data/model.ts

src/mol-data/model/builders/mmcif.ts

src/mol-data/model/properties/hierarchy.ts

src/mol-data/model/utils/hierarchy-keys.ts

src/mol-data/structure/base.ts

src/script.ts