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Fix for ALFA_SimHitsTestTool (ATLASSIM-5034)

John Chapman requested to merge jchapman/athena:ATLASSIM-5034_master into master

ALFA_SensitiveDetector can make hits with plate==100 for GVS volumes. Usually 0<plate<10. The hit plotting code in ALFA_SimHitsTestTool assumes a maximum value of 10 when it uses plate as the index to arrays, so when a hit with plate==100 is processed this ends up well outside the array and corrupts the stack. The fix is to put the GVS hits into a separate histogram, skipping the stage where they are used as the index to an array.

Closes ATLASSIM-5034

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