message: added StructureElement.Loci.toStructure
diff: @@ -78,6 +78,17 @@ export namespace Loci {
  return Loci(structure, []);
  }
  + export function toStructure(loci: Loci): Structure {
  + const units: Unit[] = []
  + for (const e of loci.elements) {
  + const { unit, indices } = e
  + const elements = new Int32Array(OrderedSet.size(indices))
  + OrderedSet.forEach(indices, (v, i) => elements[i] = unit.elements[v])
  + units.push(unit.getChild(SortedArray.ofSortedArray(elements)))
  + }
  + return Structure.create(units, { parent: loci.structure.parent })
  + }
  +
  export function remap(loci: Loci, structure: Structure): Loci {
  if (structure === loci.structure) return loci
  