support local users and their access
we should support the ability for users to "lower" from admin (the default with Amahi login) to any other (local) user in the machine.
this in turn includes customizing the access for that local user, for example, hidden shares, share access permissions, etc.
a simple way to do this, the only other way to change users would be to log out this user and ask the admin to log in again.
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