Pyedit command to open module files with jedi completion for module names

:Pyedit [++opt] [+cmd] module

    module is a python module, there is a completion for them as well.
    [opt] and [cmd] are like for the :edit command.

Secondly add a g:jedi#quickfix_window_height option, since 3 (the current option) seems arbitrary and does not reflect the vim default (which is 10, ":help :copen")