Add info how SIDs are created in case of permissions and acl
When there is no user mapping, option
permissions induces the creation of pseudo-SIDs by a special recipe.
It would be helpful, if this behaviour and the recipe would be described on:
http://www.tuxera.com/community/ntfs-3g ... rmissions/Is the recipe the same for option
acl?
Additionally it may be helpful to note, that option
acl seems quite useless without user mapping.
