Colin Walters 3326e13481 lib: Add diff API
This is a *third* implementation of rpm database diffs in the code,
but it is now a public introspectable shared library API.

Further commits will change the command line tools to use this, and
then after that we'll further deduplicate the `db diff` from this
code.
2015-04-23 16:30:18 -04:00
..
2015-04-23 16:30:18 -04:00