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IoComponentMgr: Add interface to retrieve all filenames of component

Frank Winklmeier requested to merge fwinkl/Gaudi:iocompmgr_retrieve into master

Add a method io_retrieve(IIoComponent*) to retrieve all registered file names for a given IO component.

This can be used to check if a certain component registered any output files at all and if yes to loop over them. Required e.g. in the ATLAS HLT to create additional sub-directories if there are histogram files written.

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