Cache for our installed and available packages, pulled in from yum-dump.py
Return an array of packages allowed to be installed multiple times, such as the kernel
Return the latest available version for a package.arch
Alias for available_version
Return the currently installed version for a package.arch
Check for package by name or name+arch
Return the source repository for a package-version.arch
Returns a array of packages satisfying an RPMDependency
Cache management
Check if a package-version.arch is available to install
[Validate]