Tests and comments on search multiple containers => DONE

...ple/containers/abstract-search-multiple.component.spec.ts

...multiple/containers/abstract-search-multiple.component.ts

...nce/search-multiple/containers/datasets.component.spec.ts

...instance/search-multiple/containers/datasets.component.ts

...nce/search-multiple/containers/position.component.spec.ts

...instance/search-multiple/containers/position.component.ts

...rch-multiple/containers/result-multiple.component.spec.ts

...e/search-multiple/containers/result-multiple.component.ts

...nstance/search-multiple/search-multiple-routing.module.ts

...nstance/search-multiple/search-multiple.component.spec.ts

...rc/app/instance/search-multiple/search-multiple.module.ts