Re #19794 Removed old powder diffraction data

Testing/Data/SystemTest/GEM/GEM46487.raw.md5

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Testing/Data/SystemTest/GEM/GEM46488.raw.md5

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Testing/Data/SystemTest/GEM/GEM46489.raw.md5

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Testing/Data/SystemTest/GEM/GEM48037.raw.md5

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Testing/Data/SystemTest/GEM/GEM48038.raw.md5

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Testing/Data/SystemTest/GEM/GEM48039.raw.md5

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Testing/Data/SystemTest/GEM/GEM48436.raw.md5

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Testing/Data/SystemTest/GEM/VanaPeaks.dat.md5

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Testing/Data/SystemTest/GEM/test/Cycle_09_5/Calibration/van_8mm_15x40_spline30-0.nxs.md5

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Testing/Data/SystemTest/GEM/test/Cycle_09_5/Calibration/van_8mm_15x40_spline30-1.nxs.md5

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Testing/Data/SystemTest/GEM/test/Cycle_09_5/Calibration/van_8mm_15x40_spline30-2.nxs.md5

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Testing/Data/SystemTest/GEM/test/Cycle_09_5/Calibration/van_8mm_15x40_spline30-3.nxs.md5

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Testing/Data/SystemTest/GEM/test/Cycle_09_5/Calibration/van_8mm_15x40_spline30-4.nxs.md5

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Testing/Data/SystemTest/GEM/test/Cycle_09_5/Calibration/van_8mm_15x40_spline30-5.nxs.md5

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Testing/Data/SystemTest/GEM/test/Cycle_09_5/mantid_tester/GEM_095_calibration.pref.md5

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Testing/Data/SystemTest/GEM/test/Cycle_09_5_No_ExtV/mantid_tester/GEM_095_calibration_noExtV.pref.md5

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Testing/Data/SystemTest/GEM/test/GrpOff/offsets_2009_cycle094.cal.md5

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Testing/Data/SystemTest/GEM/test/GrpOff/offsets_2011_cycle111.cal.md5

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Testing/Data/SystemTest/PEARL/Calibration_Test/Calibration/pearl_absorp_sphere_10mm_newinst2_long.nxs.md5

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Testing/Data/SystemTest/PEARL/Calibration_Test/Calibration/pearl_group_12_1_TT35.cal.md5

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