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First implementation of gpart motion

Merged Matthieu Schaller requested to merge gpart_motion into master

The changelog is rather big but the changes are rather straightforward:

  • The acceleration of the gparts is now called a_grav instead of just a. Makes grepping through the files much easier.
  • I have added the command-line options -g and -G for external- and self-gravity respectively. These build the correct policies into the engine. Separating both (at least for now) allows to work on the two aspect separately.
  • There are tests in critical places to make sure that linked pairs part-gpart are at the same position.
  • The doinit(), dodrift() and dokick() tasks have been updated to also move the gparts.

All the tests pass successfully. I am seeking your opinion on the implementation of the tasks.