Use debconf to ask questions.
This allow us to:
- install deb packages using apt frontends (noninteractive, readline,
etc).
- display the questions on graphical installers like Gdebi.
closes#75
* Purge files when using apt remove --purge
* Display a message to uninstall installed pkgs from pypi when invoking
apt remove
* link autostart .desktop file to /usr/share/applications instead of
copying it
