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xAODCaloEvent+xAODPFlow+AthContainersRoot; Dictionary fixes

Scott Snyder requested to merge ssnyder/athena:dict.xAODCaloEvent-20201022 into master

Need to generate VectorFactory dictionaries for CaloClusterBadChannelData and vector<pair<EL, double> >.

getClassIfDictionaryExists() was calling GetClassSharedLibs() to try to tell if a class was present in a rootmap file, and thus avoid triggering autoparsing. However, in recent root versions, GetClassSharedLibs itself can trigger autoparsing, followed by an unload which can confuse things. GetClassSharedLibs is now doing more harm than good, so remote the call to it.

Still need to see if we can find a reliable way of failing a TClass lookup rather than triggering autoparsing.

See ATEAM-662.

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