message: removed orientation from measurements for now
  too limited and confusing
diff: * Copyright (c) 2020 mol* contributors, licensed under MIT, See LICENSE file for more info.
  *
  * @author Alexander Rose <alexander.rose@weirdbyte.de>
  + * @author David Sehnal <david.sehnal@gmail.com>
  */
  import * as React from 'react';
  @@ -62,7 +63,6 @@ export class MeasurementList extends PurePluginUIComponent {
  {this.renderGroup(measurements.distances, 'Distances')}
  {this.renderGroup(measurements.angles, 'Angles')}
  {this.renderGroup(measurements.dihedrals, 'Dihedrals')}
  - {this.renderGroup(measurements.orientations, 'Orientations')}
  </div>;
  }
  }
  @@ -104,17 +104,10 @@ export class MeasurementControls extends PurePluginUIComponent<{}, { isBusy: boo
  this.plugin.managers.structure.measurement.addLabel(loci[0].loci);
  }
  - addOrientation = () => {
  - // TODO: this should be possible to add for the whole selection
  - const loci = this.plugin.managers.structure.selection.additionsHistory;
  - this.plugin.managers.structure.measurement.addOrientation(loci[0].loci);
  - }
  -
  get actions(): ActionMenu.Items {
  const history = this.selection.additionsHistory;
  const ret: ActionMenu.Item[] = [
  { kind: 'item', label: `Label ${history.length === 0 ? ' (1 selection required)' : ' (1st selection)'}`, value: this.addLabel, disabled: history.length === 0 },
  - { kind: 'item', label: `Orientation ${history.length === 0 ? ' (1 selection required)' : ' (1st selection)'}`, value: this.addOrientation, disabled: history.length === 0 },
  { kind: 'item', label: `Distance ${history.length < 2 ? ' (2 selections required)' : ' (top 2 selections)'}`, value: this.measureDistance, disabled: history.length < 2 },
  { kind: 'item', label: `Angle ${history.length < 3 ? ' (3 selections required)' : ' (top 3 selections)'}`, value: this.measureAngle, disabled: history.length < 3 },
  { kind: 'item', label: `Dihedral ${history.length < 4 ? ' (4 selections required)' : ' (top 4 selections)'}`, value: this.measureDihedral, disabled: history.length < 4 },
  