Add script to validate set of COSMOS DECam reductions.

Create a new script with a defaultData suitable for running
against the set of DECam images of the COSMOS field as processed
at NCSA.  The simple validateDecam.py load just a couple of dataIds
from validate_data_decam.  This new script looks at 9 z-band visits.

bin.src/validateDecamCosmos.py

@@ -0,0 +1,63 @@
+#!/usr/bin/env python
+
+# LSST Data Management System
+# Copyright 2008-2016 AURA/LSST.
+#
+# This product includes software developed by the
+# LSST Project (http://www.lsst.org/).
+#
+# 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 LSST License Statement and
+# the GNU General Public License along with this program.  If not,
+# see <https://www.lsstcorp.org/LegalNotices/>.
+
+from __future__ import print_function
+
+import os.path
+import sys
+
+from lsst.validate.drp import checkAstrometryPhotometry
+
+
+def defaultData(repo):
+    # List of visits to be considered
+    visits = [176837, 176839, 176840, 176841, 176842, 176843, 176844, 176845, 176846]
+
+    # List of CCD to be considered (source catalogs will be concateneted)
+    ccd = [10, 11, 12, 13, 14, 15, 16, 17, 18]
+    filter = 'z'
+
+    # Reference values that the DECam analysis should pass
+    #  for the median astrometric scatter and the number of matches
+    good_mag_limit = 21  # [mag]
+    medianRef = 25  # [arcsec]
+    matchRef = 10000  # [number of stars]
+
+    visitDataIds = [{'visit': v, 'filter': filter, 'ccdnum': c} for v in visits
+                    for c in ccd]
+
+    return visitDataIds, good_mag_limit, medianRef, matchRef
+
+if __name__ == "__main__":
+    if len(sys.argv) != 2:
+        print("""Usage: valid_cosmos repo
+where repo is the path to a repository containing the output of processCcd
+""")
+        sys.exit(1)
+
+    repo = sys.argv[1]
+    if not os.path.isdir(repo):
+        print("Could not find repo %r" % (repo,))
+        sys.exit(1)
+
+    args = defaultData(repo)
+    checkAstrometryPhotometry.run(repo, *args)