Implement 687423 Implement SeparationOrder for psdcmyk device

Implement 687423  Implement SeparationOrder for psdcmyk device.

DETAILS:

The following changes are for implementing the SeparationOrder
parameter for the psdcmyk device.

The change consists of the following:

1.  Several routines which were duplicated in the spotcmyk
and psdcmyk devices were restructured to allow the use of
common subroutines.  As part of this effort the various
common DeviceN related parameters were separated into a
substructure (call devn_params).  This allows the use of
common routines even though the devices do not have the
same overall device description structure.

2.  Changes to the src/gdevpsd.c module for actually collecting
the SeparationOrder parameter data and then using it.  Note:
The treatment of separations is different for the process
color model colorants versus the spot colors.  The colorants for
the process color model do not have their order changed.  The
output file always starts with information for the CMYK channels.
If one of these colorants is not specified in the SeparationOrder,
then the output channel data in the file will simply be 'blank'.
Spot colors follow CMYK data.  They are rearranged.  Only the
spot colors specified are output.

3.  Several checks in src/gdevdflt.c and src/gxcmap.c had to
be removed or modified.  These checks were assuming that a
device with a single component uses a gray process color
model and a device with three components used RGB.


Dan

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