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Implementation Pressure entropy SPH

Matthieu Schaller requested to merge PressureEntropy_SPH into master

Here is a new flavour of SPH that works and gives better result than the default Gadget-2 scheme.

The only change affecting the rest of the code is the addition of the condition in engine_init_particles() to create a second density loop over the particles for the special conversions that are required in this scheme. Other than that, it just fits in the rest of the framework.

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