Comment 2 for bug 1391930

Per discussions on ubuntu-phone@ (https://lists.launchpad.net/ubuntu-phone/msg10456.html), the directory structure for these global directories is:

/media/$user/$label/Pictures
/media/$user/$label/Music
/media/$user/$label/Videos

'$label' is confirmed to not allow '/' in the name. Because the directories may be on a vfat filesystem, we want the policy to be able to handle case-insensitive names.

As such, we'll adjust the policy groups accordingly to do things like this:
  # SD card: /media/<user>/<label>/...
  owner /media/*/*/[Mm][Uu][Ss][Ii][Cc]/ r,
  owner /media/*/*/[Mm][Uu][Ss][Ii][Cc]/** rwk,

  # SD card: /media/<user>/<label>/...
  owner /media/*/*/[Pp][Ii][Cc][Tt][Uu][Rr][Ee][Ss]/ r,
  owner /media/*/*/[Pp][Ii][Cc][Tt][Uu][Rr][Ee][Ss]/** rwk,

  # SD card: /media/<user>/<label>/...
  owner /media/*/*/[Vv][Ii][Dd][Ee][Oo][Ss]/ r,
  owner /media/*/*/[Vv][Ii][Dd][Ee][Oo][Ss]/** rwk,

IMPORTANT: the policy will not allow creating these directories (just like it doesn't for the ones in ~), so something else will have to create them.