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BUG: invert sign of stress from QE

username-removed-261087 requested to merge tdaff/ase:qe_stress_convention into master

I think the sign convention for stresses in Quantum ESPRESSO is the opposite of what is expected for ase.

If I compress a system, QE gives stresses as +ve quantities, but ase calculators are giving me -ve. This change flips the sign to make the stresses consistent.

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