Read `py-python3-command-args'
Improved docstrings

`py-keep-windows-configuration'
`py-split-windows-on-execute-p'
`py-switch-buffers-on-execute-p'

`py-keep-windows-configuration-test' added
`py-ert-execute-block-fast' fixed

`py-ert-execute-block-fast-2' fixed
`py--run-unfontify-timer', correct wrongly fontified shell banner

py-shell-unfontify-p, default is t
vars `py--timer' `py--timer-delay'

Is there a better way to do this?
`py-fast-process' fixed
Remove unused `inferior-python' stuff

`inferior-python -filter-regexp' renamed `py-input-filter-re'
Docu updated
Avoid errors from ipython.el - which isn't needed anymore
(defvaralias 'py-mode-map 'python-mode-map)

Same with `py-shell-map'