added Structure.asParent

src/extensions/cellpack/model.ts

src/mol-model/structure/query/queries/internal.ts

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

src/mol-repr/structure/complex-representation.ts

src/mol-repr/structure/representation/ball-and-stick.ts

src/mol-repr/structure/representation/ellipsoid.ts

src/mol-repr/structure/representation/line.ts

src/mol-repr/structure/units-representation.ts

src/mol-repr/structure/visual/bond-inter-unit-cylinder.ts

src/mol-repr/structure/visual/bond-inter-unit-line.ts

src/mol-repr/structure/visual/bond-intra-unit-cylinder.ts

src/mol-repr/structure/visual/bond-intra-unit-line.ts

src/mol-repr/structure/visual/element-point.ts

src/mol-repr/structure/visual/ellipsoid-mesh.ts

src/mol-repr/structure/visual/util/bond.ts

src/mol-repr/structure/visual/util/element.ts