afpcmd: option to list FinderInfo metadata

[rdmark]

it would be handy to be able to opt in to list FinderInfo metadata for volumes that have classic Mac files, emulating f.e. how nad presents it:

example from the nad man page:

List files in a shared AFP volume:

    $ nad ls -al /srv/afpshare
    ---Nic-s--- ------ --- ---- ----           2   .
    ----------- ------ --- ---- ----           1   ..
    ----i---b-- ------ --- APPL SBMC          40   AppleShare IP Browser
    ---------v- ------ --- ---- ----          36   Network Trash Folder
    -------s-v- ------ --- ---- ----          35   TheVolumeSettingsFolder
    ----ic-s--- ------ gre PNGf GKON          39   picture 1.png
    ----ic----- ------ --- PNGf GKON          41   picture 2.png
    ----ic----- ------ --- PNGf GKON          42   picture 3.png

Legend:

- column 1: Finder flags
- column 2: AFP attributes
- column 3: color label
- column 4: type
- column 5: creator
- column 6: CNID from AppleDouble
- column 7: file name