update our_run_code() for iPython 3+

[quantumsteve]

This fixes #11692.

The script interpreter is broken with iPython 3.0+.

In [8]: import numpy
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
TypeError: our_run_code() takes exactly 2 arguments (3 given)

This version adds a third optional argument named result that needed to be added to our_run_code(). The following changes attempt to call iPython_run_code() with three arguments. If that fails, it falls back to two arguments.

testing: Verify that one can run import numpy from the script interpreter. Ideally this should be tested with iPython < 3.0 and iPython >= 3.0