Adding support for binary artifacts
    
    A new toplevel data section for listing binary artifacts, with the usual
    type-based subsections.  Currently only RPMs are supported, in the NEVRA
    format.
    
    This section should be filled in by the module buildsystem, not the
    module author.
    
    Signed-off-by: Petr Šabata <contyk@redhat.com>