Support bool_or with containers
Support bool_or with containers

For example, you might want an option that can either be ON or that
accepts a list or dict. For example, consider a hypothetical command
that fetches data and either shows it or returns some or all of the
fields:

    get-data               # -> get data & show it
    get-data --fields      # -> get data & return all fields
    get-data --fields a b  # -> get data & return fields a & b

wylee/runcommands,wylee/runcommands