Heya,

A few fixes, spotted by Tim Waugh.

- Use CUPS error codes:
https://bugzilla.redhat.com/show_bug.cgi?id=435082
- Output STATE information (we still need to do that when we add retry
support):
https://bugzilla.redhat.com/show_bug.cgi?id=435083
- Use DEVICE_URI envvar if available:
https://bugzilla.redhat.com/show_bug.cgi?id=435080
- Also add better error reporting from hcrp_print() and spp_print()

There's 2 other bugs that are closely related and need more code
movement:
https://bugzilla.redhat.com/show_bug.cgi?id=435084
https://bugzilla.redhat.com/show_bug.cgi?id=435081

Cheers

PS: Resend