Python shells dedicated to a project

Python shells dedicated to a project

* lisp/progmodes/python.el: Require 'seq' and (optionally) 'compat'
and 'project' libraries.
(python-shell-dedicated): New user option
(python-shell-get-process-name): Adapt to project-dedicated shells.
(run-python): Offer possibility to create a project-dedicated shell,
or use 'python-shell-dedicated' as the default behavior.
(python-shell-get-buffer): Adapt to project-dedicated shells
(bug#56997).