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change pow(x,0.25) to sqrt(sqrt(x))

Christos Anastopoulos requested to merge ATLAS-EGamma/athena:STEP_propagator_pow_to_2xsqrt into master

It seems that we were calling quite often pow(x,0.25)

sqrt(sqrt(x)) could potentially be better in this case.

Mentioning @amete as would be serious to see the effect in the SPOT timing

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