Feature/parcel boundary updates

[dxinteractive]

dataparcels

• Fix: Parcel._boundarySplit() was not using _this._treeshare.boundarySplit() Fix: make Parcel._boundarySplit() replace treeshare with treeshare.boundarySplit() #109

react-dataparcels

• Add ParcelBoundary.actions.cancel() to be able to cancel changes in a parcel boundary
• Fix: Default behaviour for ParcelBoundary should be to clear the change buffer when a new parcel is received via props, as we can't assume the changes in the buffer are able to be applied to the new parcel's data.
  • This will become the "replace" mergeMode in a later release: Add: ParcelBoundary.mergeMode #110
• Redo all ParcelBoundary tests to avoid setTimeout or any nested expect calls.

dataparcels-docs

• Add ParcelBoundary.childRenderer docs
• Add ParcelBoundary.actions.cancel() to docs