ShowAvailablePackages
fShowAvailablePackages = value->ShowAvailablePackages();
if (!fSource.IsSet() || fSource->ShowAvailablePackages() != value) {
&& fShowAvailablePackages == other.ShowAvailablePackages()
bool ShowAvailablePackages() const;
fShowAvailablePackagesItem->SetMarked(packageFilterSpecification->ShowAvailablePackages());
fModel.FilterSpecification()->ShowAvailablePackages());