qtconsole: Add vi-like key bindings to pager (fixes #6590)
qtconsole: Add vi-like key bindings to pager (fixes #6590)

Since _event_fileter_page_keypress() already exists in ConsoleWidget
class of qtconsole, that change was pretty easy and isolated. We emulate
up/down arrow keys with k/j when we use pager.

ipython/ipython,ipython/ipython