list-memberships and perms changes:

  - list-memberships now requires a '-r' or '-u'; i.e., you have to
    explicitly state whether you are passing a reponame or a username

    see the new '-h' message for details.

  - Easy.pm now has a new 'in_role()' test that is, at present, only
    used by 'owns()', which uses that instead of checking that he is the
    creator.

    The role name used (I recommend "OWNER") must be set in the rc file
    like so

        OWNER_ROLENAME => 'OWNER',

    and if it is not set, defaults to 'CREATOR', which makes it behave
    as things currently do.

  - perms now uses this new 'owns()' function to authorise the user,
    instead of checking that she is the *creator*