The examples in this directory have been superseded.  The isr.py and
runAssembleTask.py scripts produce results that can be obtained from
the runIsr.py command line task.  Some of the exampleUtils.py code to
generate fake image data will be included in the new isrMock.py code.

The added IsrMock code is based on the afw/cameraGeom/testUtils.py and
afw/cameraGeom/utils.py code to provide a complete camera
geometry/detector/amplifier set, and replaces some example code from
ip_isr/examples.  The new mocks can be constructed to either represent
a "raw" exposure with the inclusion of various instrument signals
(bias, dark, flat, etc.), as well as the master calibration frame to
allow the removal of those instrument signals.  A Gen-2 butler dataRef
can also be constructed, to test that IsrTask properly retrieves the
appropriate mock data.