We propose the following enhancements to particle_tracerET:

• Introduces computation and output of particles' four-velocity;
• Enables output in binary format;
• Minor adjustments to the code (e.g., printf -> CCTK_VINFO);
• Whitespace cleanups;
• The number of particles is no longer limited to 10000, and now instead is set by the usual parameter num_particles.

We also provide a small code that converts binary output files to ASCII.

These features are part of this pull request.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2691/new-features-to-particle_traceret