Updated package.json.
Straightened seeding.
Trigger event on Graph reset.
Not a change.
Use GraphErrors.
Verify seed against schema name + version.
Do not apply empty diff updates.
WS.
Introduce a generalized hierarchical Index API.
Remove obsolete PropertyChangeAdapter.
Add helper to apply co-transformations for Graph operations.
Split Graph test into smaller pieces.
Improve Graph Index.

Added dedicated test.
Handle compounds when triggering 'property:updated'.
Fix cotransform helper implementation.
Fix regression.

After fixing a bug in Graph an error in the Graph Event Test has been
revealed.
Allow null as values.
Graph index only stores ids.

However, Index.get() provides node instances.
Use operation iteration helpers.
Make graph indexes first class event listeners.

I.e., instead of updating indexes via 'operation:applied' events,
they are updated by the graph explicitely.