Script the removal of packages from vescum
Currently we have the problem that sometimes, a still-referenced version of a package gets removed from vescum too early. We should figure out some kind of script that produces a list of all packages it thinks are OK to delete, and then that list can be used to sanity-check the to be removed packages. Note that I don't mean automated deletion, as this probably produces issuse with newly transferred stuff. If this script works well and we manage to get some sanity injected into the package uploading process, we can then automate it.
Assigning this to me for now, because I don't think phobos will want to do it