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Modules/FileDataWriter: warn if pattern does not yield unique files

Enrico Gamberini requested to merge (removed):fix-unique-filedatawriter into develop

While '%D' can yield unique files it has a resolution of 1s. If FileGenerator::next() is called too often, output files will be overwritten and data will be lost.

Additionally: if an output file already exists (e.g., consecutive FileDataWriter runs without '%D' specified) files will be silently overwritten. How do we want to handle this?

Edited by Enrico Gamberini

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