F9 broken in latest git master

[dhirschfeld]

Pressing F9 in the editor gives the below traceback in the internal console:

>>> Traceback (most recent call last):
  File "C:\dev\packages\spyder\spyder\app\mainwindow.py", line 2415, in execute_in_external_console
    console.execute_code(lines)
TypeError: execute_code() missing 1 required positional argument: 'clear_variables'

[dhirschfeld]

https://github.com/spyder-ide/spyder/blob/master/spyder/app/mainwindow.py#L2415
https://github.com/spyder-ide/spyder/blame/master/spyder/plugins/ipythonconsole.py#L848

[goanpeca]

@rlaverde please take this one

[ccordoba12]

This has to be done against 3.x not master. @rlaverde, please make clear_variables=False at the line pointed by @dhirschfeld in ipythonconsole.py.