module docstring when following comment, lp:1102011

Thanks Tom Willemsen for the patch
variable `py-fill-docstring-style' renamed `py-docstring-style'
menu PyTools, section "Modes" renamed "Switches"

moved upward below "Customize Python Mode"
`py-shell-complete' or `ipython-complete' with emacs 24.1 and Windows, lp:1102226

reverted part of r1688