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Make sure writer is cleaned up before destructor.

Dave Pugmire requested to merge dpugmire/fides:fix_writer_destructor into master

When the DataSetAppendWriter is destructed, it calls a close on the adios engine. If this happens after MPI_Finalize(), it will cause errors because adios is making MPI calls. This came up in a simple code where everything happened inside of main(). The writer was in the main function's scope. This also fixes an issue in the test-write where it was not doing step selection correctly.

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