[BUG]: McXtrace and GPU: Indications of thread collisions

[willend]

Describe the bug
Looking at today’s output ’nightlies’ output a few tests are off betwen CPU and GPU with indication of thread race conditions:

• MAXIV_FemtoMAX
• SOLEIL_PSICHE
• Test_ML_elliptic
• Test_Absorption
• Test_FluoPowder
• Test_PowderN
• Test_SX
• (These are off both GPU+CPU SOLEIL_PX2a.instr Template_Johann_spec.instr Test_KN_Comp_Rayl_union.instr already meant to be fixed elsewhere)
• PowderCompton_union seems to simply crash at the moment