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Enable AthenaSharedWriter in StandAlone mode.

Peter Van Gemmeren requested to merge gemmeren/athena:AthenaSharedWriter_StandAlone into master

This is a new feature extending Athena Shared I/O (writer first/only) to run stand alone outside of AthenaMP. It should not affect any existing functionality.

The MR also allows the SharedWriter and its client to be used in 'metadata only' mode, where the clients write event data directly, but metadata is handled/summarized by the SharedWriter. As new development, in master, with the new RoorTreeIndex navigation, this could be combine with using ROOT TMemFile and TBufferMerging to allow more concurrent output (to be presented at a Core SW meeting).

Edited by Peter Van Gemmeren

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