message: fixed StructureElementIterator.fromGroup to pick unit corresponding to instance
diff: @@ -87,11 +87,12 @@ export function getElementLoci(pickingId: PickingId, group: Unit.SymmetryGroup,
  export namespace StructureElementIterator {
  export function fromGroup(group: Unit.SymmetryGroup): LocationIterator {
  - const unit = group.units[0]
  const groupCount = group.elements.length
  const instanceCount = group.units.length
  - const location = StructureElement.create(unit)
  - const getLocation = (groupIndex: number) => {
  + const location = StructureElement.create()
  + const getLocation = (groupIndex: number, instanceIndex: number) => {
  + const unit = group.units[instanceIndex]
  + location.unit = unit
  location.element = unit.elements[groupIndex]
  return location
  }
  