Cleanup delete / add

[guilhem]

• Add distribution codename to url_filename Fix Package overwrite in pool between distribution #55
• remove file from pool when delete
• remove package when NOT preserve-version

⚠️ big changes

[guilhem]

@krobertson this is a new way to manage #57

It's pretty big and lacks tests / verify / all for the moment. But manage pool in a good way.

I will update PR this week to complete missing features.

Feel free to comment, it's pretty big work ^^

[htmldoug]

👍 for adding a Logger.

[htmldoug]

Looks like a lot of refactoring and introduction of a logger. It's going to be a few days before I'd be able to review this in depth.

[guilhem]

Yes... Wow such refactor much logger ^^

But I try to cleanup every parts.

I think it's really easier to read now than before ;)

[guilhem]

Job done!