Removed unused transition.
Added mult.svg to edit overlay.
Incoming data is now sent to all plots to determine if they want it.
Beginnings of multiChart. Currently crashes the server.
Removing plots works properly again.

Fixes #143
Adding a multiChart now puts it above the first parent chart.
Beginning of displayThisChart chart property.
Removing a multiChart spawns its two parents.
Merge branch 'master' into deploy_client