Compare files changed in Linux packages

[nightlark]

Write a script to go through all packages in two different releases of a Linux distro, and see what file names installed changed in each package between the two releases.

Follow on is using the script on a very new Ubuntu package release and a very old version and doing a survey of how "stable" file names are for stuff under bin, include, etc. Packages that are entirely removed could also be interesting.

(For comparing across Linux distros, we'd need to somehow map package names in one distro to the corresponding package name in another distro -- so for now keep comparisons within different versions of the same distro).

[nightlark]

1. How many packages have a t64 suffix in a version of Ubuntu prior to them adding it to a bunch of package names?
2. What are the .so file name changes that aren't just incrementing a version number in the file name (e.g. how often do we see a new normalized name appearing, and normalized name being removed from one major version of Ubuntu to another)?