If the project is not saved at all, it will suggest to save it manually
or to define a project in a temporary folder using date/time for the
project name.
Reoganization
- BaseNode: is the base class for all nodes
- Node: is now dedicated to python nodes, with the implentation directly
in the process function
- CommandLineNode: dedicated to generate and run external command lines
The desc.Node.onCreated callback is a hook in the Node API for developers to
write custom behavior on a node first initialization.
By being called in the core.Node constructor, this was triggered in several situations
that don't match this idea and with unpredictable side effects (graph loading, node re-creation on undo...).
* Make `onNodeCreated` callback an explicit method on desc.Node.
* Remove the call to node descriptor's `onNodeCreated` callback outside core.Node constructor.
* Trigger this callback on explicit node creation (adding new node to graph, init a graph from a template).
