wheezy: list newly installed packages
_Originally created by Tails on [#5891 (Redmine)](https://public-redmine-archive.tails.boum.org/code/issues/5891)_
List newly installed packages. Then, we can decide to remove some.
Parent Task: tails/tails#6015
### Related issues
- **Related to** tails/tails#5577
issue