Merge branch 'master' into bond-repr

src/mol-model/sequence/constants.ts

src/mol-model/sequence/sequence.ts

src/mol-model/structure/model.ts

src/mol-model/structure/model/formats/mmcif.ts

src/mol-model/structure/model/formats/mmcif/bonds.ts

src/mol-model/structure/model/formats/mmcif/sequence.ts

src/mol-model/structure/model/model.ts

src/mol-model/structure/model/properties/atomic/hierarchy.ts

src/mol-model/structure/model/properties/sequence.ts

src/mol-model/structure/model/types.ts

src/mol-model/structure/query/selection.ts

src/mol-model/structure/structure.ts

src/mol-model/structure/structure/structure.ts

src/mol-model/structure/structure/unit.ts

src/mol-model/structure/structure/unit/bonds/intra-data.ts

src/mol-model/structure/structure/unit/links.ts

src/mol-model/structure/structure/unit/links/common.ts

src/mol-model/structure/structure/unit/links/data.ts

...mol-model/structure/structure/unit/links/inter-compute.ts

...mol-model/structure/structure/unit/links/intra-compute.ts