AthDerivation Updates, master branch (2022.06.22.)

This is meant to help ATLINFR-4562 further along, making AthDerivation more usable in the master branch.

• Taught the AthenaConfiguration.OldFlags2NewFlags module how to handle not all packages being available. This module is imported very early in AthDerivation jobs. In order to avoid having to add all referenced packages to that project, the module now expects the non-core packages to possibly not be available. Giving INFO messages about every package/module not found.
• Updated the (internal and external) package list of AthDerivation. Unfortunately these updates do not make everything work all of a sudden. 😦 But perfect is the enemy of good, so I wanted to at least add these updates already...