Dose_common.CudfDiffSourcea tuple holding the packages to be installed and the packages to be removed
associates to each package name a change_set containing for each package name the associated versions of this package to be installed and removed
return a changeset containing all the packages to be installed and/or removed
return the difference table where packages are indexed by package name
type summary = {install : Cudf.package list;remove : Cudf.package list;upgrade : (Cudf.package * Cudf.package) list;downgrade : (Cudf.package * Cudf.package) list;notchange : Cudf.package list;}The list of packages to install, remove, etc