Refactor group to dataset group

...admin/instance/containers/configure-instance.component.ts

...in/instance/containers/instance-group-list.component.html

...ataset-group/components/dataset-group-form.component.html

.../dataset-group/components/dataset-group-form.component.ts

...taset-group/components/dataset-group-table.component.html

...dataset-group/components/dataset-group-table.component.ts

.../src/app/admin/instance/dataset-group/components/index.ts

...ataset-group/containers/dataset-group-list.component.html

.../dataset-group/containers/dataset-group-list.component.ts

...ataset-group/containers/edit-dataset-group.component.html

.../dataset-group/containers/edit-dataset-group.component.ts

...dataset-group/containers/new-dataset-group.component.html

...e/dataset-group/containers/new-dataset-group.component.ts

...in/instance/dataset-group/dataset-group-routing.module.ts

.../app/admin/instance/dataset-group/dataset-group.module.ts

...stance/dataset/components/instance-buttons.component.html

client/src/app/admin/instance/instance-routing.module.ts

client/src/app/metamodel/actions/dataset-group.actions.ts

client/src/app/metamodel/actions/group.actions.ts

...t/src/app/metamodel/effects/dataset-group.effects.spec.ts