[cups.general] Per User configuration

[marc at arctic.net]

I would like to be able to have an individualized per user
CUPS configuration file so that I can limit what printers are
accessible to specific users.

I tried to limit printers via authentication in <Location
/printer/name/> and the GUI (Mac OS X) on Macs provides no
response and the command line does not seem to prompt either.
I set AuthType to Basic and AuthClass to System simply to get
the system to prompt.  

I also tried to just disable certain printers so that only
admins could enable certain printers.  The GUI provided no
indication that a printer was disabled.  I did notice that the
remote print server will prompt for password on the print
server to cancel jobs from a local host,  but when I tried to
enable a printer the OS reponded that there was a bash shell
error.