Add rpm -a support to rpmls
    
    And grow a more robust handling of options and arguments. Using the -p
    option should be based on whether the argument refers to a file instead
    of a heuristic based on a glob expression `*.[sr]pm` that somehow will
    accept `.spm` as a valid RPM extension.
    
    It becomes possible to compose commands like this:
    
        rpmls -la varnish\* |
        awk '/^d/ {print $NF}' |
        sort