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Fix the sign of the gas angular momentum around the BH in the EAGLE model.

Matthieu Schaller requested to merge BH_spin_sign_fix into master

Fixes #791 (closed).

Fixes the sign of the BH quantity bp->circular_velocity_gas (aka. GasCircularVelocities in the snapshots).

The norm of that vector was also used internally when using the Rosas-Guevara+15 angular momentum limiter.

This fix has hence no consequences on the existing models' dynamics but only leads to a mistake in the outputs.

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