fixup! Graph editor: remove node_id from node_id_to_dom_element_id when node is removed (from Ioannis)

Graph Editor: event handling promise where not in the tree of promise, so errors in those promise where silently ignored

Also fix the bug that data is not updated before beeing sent to simulation
server

- Source properties are missing
- General properties are missing

Conflicts:
	dream/platform/src/jsplumb/jsplumb.js

Tests relying on node edition popup are not working yet