message: Remove comment-out unused import
diff: import { SetUtils } from '../../../../mol-util/set';
  import { Unit } from '../../structure';
  -// import { QueryContext, QueryFn, QueryPredicate } from '../context';
  import { QueryContext, QueryFn } from '../context';
  import { StructureQuery } from '../query';
  import { StructureSelection } from '../selection';
  