Merge pull request
#1771 from mwhansen/configurable-interactivity...
Merge pull request
#1771 from mwhansen/configurable-interactivity
Make default value of interactivity passed to run_ast_nodes configurable.
This allows users to select if they want all nodes in a cell (groups of lines that can be run as a single statement) to produce output via `sys.displayhook` instead of our default policy, where only the last node is run in this way.