Make IsrTask a valid CmdLineTask.

The IsrTask was not usable as a CmdLineTask, as it was written to be
called as a subtask of ProcessCcdTask.  This allows the default
IsrTask to be retargeted to camera-specific versions of the ISR
processing.  A new IsrWrapperTask now exists to hold IsrTask for
retargetting in standalone processing, and both processCcd.py and
runIsr.py now read from the same configuration files for each obs_
package.  This has involved migrating configuration values from
config/processCcd.py to config/isr.py for many obs_ packages.

bin.src/runIsr.py

@@ -0,0 +1,26 @@
+#!/usr/bin/env python
+#
+# This file is part of ip_isr.
+#
+# Developed for the LSST Data Management System.
+# This product includes software developed by the LSST Project
+# (https://www.lsst.org).
+# See the COPYRIGHT file at the top-level directory of this distribution
+# for details of code ownership.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+#
+from lsst.ip.isr.isrTask import IsrWrapperTask
+
+IsrWrapperTask.parseAndRun()

python/lsst/ip/isr/isrTask.py

@@ -1225,3 +1225,50 @@ def getSaturation(self):
 
     def getSuspectLevel(self):
         return float("NaN")
+
+
+class IsrWrapperConfig(pexConfig.Config):
+    isr = pexConfig.ConfigurableField(target=IsrTask, doc="Instrument signature removal")
+
+## @addtogroup LSST_task_documentation
+## @{
+## @page IsrWrapperTask
+## @ref IsrWrapperTask_ "IsrWrapperTask"
+## @copybrief IsrWrapperTask
+## @}
+
+
+class IsrWrapperTask(pipeBase.CmdLineTask):
+    """Task to wrap the default IsrTask to allow it to be retargeted.
+
+    The standard IsrTask can be called directly from a command line
+    program, but doing so removes the ability of the task to be
+    retargeted.  As most cameras override some set of the IsrTask
+    methods, this would remove those data-specific methods in the
+    output post-ISR images.  This wrapping class fixes the issue,
+    allowing identical post-ISR images to be generated by both the
+    processCcd and isrTask code.
+    """
+    ConfigClass = IsrWrapperConfig
+    _DefaultName = "isrWrap"
+
+    def __init__(self, *args, **kwargs):
+        pipeBase.Task.__init__(self, *args, **kwargs)
+        self.makeSubtask("isr")
+
+    def runDataRef(self, dataRef):
+        """
+        Parameters
+        ----------
+        dataRef : `lsst.daf.persistence.ButlerDataRef`
+            data reference of the detector data to be processed
+
+        Returns
+        -------
+        result : `pipeBase.Struct`
+            Result struct with component:
+
+            - exposure : `lsst.afw.image.Exposure`
+                Post-ISR processed exposure.
+        """
+        return self.isr.runDataRef(dataRef)