CUPS printing support

[Antoine Martin]

This bug is just a big tracker bug for all things related to printing.
Looks like we may need (at least for MS Windows clients... sigh) to start a CUPS server for each session (or is it for each client??):
​http://www.cups.org/documentation.php/doc-1.4/ref-client-conf.html

To deal with multiple remote users connected to the same user account (as there is only one

.cups/client.conf

)

we should be able to use the CUPS_SERVER environment variable for that:
​http://ait.web.psi.ch/services/linux/guides/system/cups/local_cups_server/
but it doesn't seem to do what it is supposed to do...

Maybe we need an IP per cups forward? (if we can't set the port number)

This bug probably depends on #7 (smb support). In theory we can print to the client via: smbclient //printserv/myprinter -c "print myfile.txt"