Draft: Sink MPI: Let's add the physics

Darwinrequested to merge
darwin/sink_mpi_physics into master

In this MR, I implemented the MPI sink tasks.

@matthieu @jdavies, here is the MR for the sink MPI. I'm starting from scratch, but here we can interact about the MPI, and you can follow my progress.

TODO

  • Implement sink formation
  • Implement sink self/pair tasks (density, swallow, do_gas_swallow and do_sink_swallow)
  • Separate SF sinks from SF (actually there is no need to do that: we only need to know how many stars we formed between SF and SF_sinks and send/recv this count once)
  • Make everything work
  • Remove debugging stuff
  • Update the doc
  • Take care of gpart data access in the Basic and GEAR models
Edited by Darwin

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