Cleanup rho dh and use of the EoS functions

Merged Matthieu Schaller requested to merge cleanup_rho_dh into master

A few more rather unimportant cosmetic changes:

  • moved rho_dh to density.rho_dh everywhere.
  • added a force.f term to contain the transformed value of rho_dh.
  • When computing the sound speed, I am now using the functions defined in equation_of_state.h everywhere.

The particles are the same size in memory as before despite the change. I had to update the tolerances for the tests as rho_dh changed meaning.

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