processed imfile names need to include Det_ID

[eugene]

the detresid imfiles currently include the DetID and the Iteration in the name.

the processed imfiles also need DetID (though not iteration since it is not

defined). this will avoid conflicts between two det runs which use the same
input file: the two runs may use different processing recipes or applied detrend
data, so the processed images are not necessarily identical.

[Paul Price]

Updated doc/ipptools/filenames.txt and
ippTools/pXtools/scripts/detrend_process.pl to include the detrend ID in the
processed imfile.

Fixes in CVS.