Algorithm for LAr ByteStream reading

For @damazio and @pavol attention: A possible implementation of Re-entrant algorithm reading LArRawChannels for ByteStream.

Notes/Comments:

• So far reading the entire RawEvent and using the eformat::helper::create_toc to filter out LAr-fragments. Do we have somewhere a list of all LAr ROB-ids?
• I did not implement all the checks for data corruption we have in the old converter
• In this simple version, the cxx is less than 150 lines long with only ~30 lines of boilerplate code that could be shared with conversion-algorithms of LAr(Calib)Digits or LArFEBHeader.

Comments are welcome!

LArCalorimeter/LArCnv/LArByteStream/python/LArRawDataReadingConfig.py

+# Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
+
+from AthenaConfiguration.ComponentAccumulator import ComponentAccumulator
+from ByteStreamCnvSvc.ByteStreamConfig import ByteStreamReadCfg
+from LArByteStream.LArByteStreamConf import LArRawDataReadingAlg
+from LArGeoAlgsNV.LArGMConfig import LArGMCfg
+
+def LArRawDataReadingCfg(configFlags):
+    acc=ComponentAccumulator()
+    acc.merge(LArGMCfg(configFlags)) #Needed for identifier helpers
+    acc.merge(ByteStreamReadCfg(configFlags))    
+    acc.addEventAlgo(LArRawDataReadingAlg())
+    return acc
+
+
+if __name__=="__main__":
+
+    from AthenaConfiguration.AllConfigFlags import ConfigFlags
+    from AthenaCommon.Logging import log
+    from AthenaCommon.Constants import DEBUG
+    from AthenaCommon.Configurable import Configurable
+    Configurable.configurableRun3Behavior=1
+    log.setLevel(DEBUG)
+
+    from AthenaConfiguration.TestDefaults import defaultTestFiles
+    ConfigFlags.LAr.doAlign=False
+    ConfigFlags.Input.Files = defaultTestFiles.RAW
+    ConfigFlags.lock()
+
+    acc=LArRawDataReadingCfg(ConfigFlags)
+    
+    from LArEventTest.LArEventTestConf import DumpLArRawChannels
+    from LArCabling.LArCablingConfig import LArOnOffIdMappingCfg 
+    acc.merge(LArOnOffIdMappingCfg(ConfigFlags))
+    acc.addEventAlgo(DumpLArRawChannels(LArRawChannelContainerName="LArRawChannels",))
+
+    #acc.getService("IOVDbSvc").OutputLevel=VERBOSE
+
+    f=open("LArRawDataReading.pkl","w")
+    acc.store(f)
+    f.close()