Pycups

* Password callbacks can now return None to indicate they want to
abort the current operation.

* cups.Connection.adminExportSamba

* Fixed rpm provides script for newer versions of rpm.

* Builds against older versions of CUPS again.

* cups.IPP_QUALITY_DRAFT, cups.IPP_QUALITY_NORMAL,
cups.IPP_QUALITY_HIGH
* cups.IPP_PORTRAIT, cups.IPP_LANDSCAPE, cups.IPP_REVERSE_PORTRAIT,
cups.IPP_REVERSE_LANDSCAPE
* cups.IPP_RES_UNITS_CM, cups.IPP_RES_UNITS_INCH
* Support for IPP_TAG_RESOLUTION as triplet (xres, yres, units).

* cups.Connection.getPPDs2(): New method, identical to getPPDs() but
returning all attribute values as lists.