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Dopair2 fix

Merged Matthieu Schaller requested to merge DOPAIR2_fix into master

Large set of improvements to the hydro interactions functions:

  • Correct version of DOPAIR2() (Fixes #361 (closed)). The symmetric condition was not correctly taken into account when computing the distance on the axis.
  • Removed the old vectorization scheme from the interaction functions. This is superseded by @jwillis' work.
  • Added the check for active/inactive in the *_NAIVE() functions. These can now correctly be used throughout a run.
  • Made all the interactions take place in the frame of the cell cj for PAIRs and c for the SELFs.
  • Added a new particle type. The particles do nothing apart from recording who they interact with in the density and force loops. This is solely designed for debugging.