`py-indent-or-complete' use `py-shell-complete' when IPython

Docu `py-complete-function'
`py--unfontify-banner' fixed
`py--shell-manage-windows' modified

When `py-keep-windows-configuration' is `t', normally point in
output-buffer would be restored also - which might not display the
recent output as point is kept above.

This change will move the point in output-buffer to point-max also if
`py-keep-windows-configuration' is `t'