Delay, make sure banner appears
`py--shell--do-completion-at-point' refactored

New functions
`py--try-completion', `py--try-completion-intern'
Provide auto-completion calling `py-shell-complete'

`py-auto-completion-mode-p' might be switched from menu

An alternative to Pymacs and `company-mode' based auto-completion,
which is delivered with `pycomplete.el' etc. --see stuff in folder
completion--

First draft - handling of the completion buffer not perfect yet.
Comments welcome.
`py-shell-name' no-op, lp:1349549

fixed