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Version Information
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Version 3
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3.x : Written in Fortran77 and developed at Stevens Institute of Technology by Dr. Marc
Mansfield and coworkers, this version can be downloaded at https://web.stevens.edu/zeno

Version 4
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4.0 : Takes version 3 and ports it to Fortran 2008

Version 5
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5.0.x : Implemented from scratch in C++, makes use of k-d trees and implements parallelism to improve performance
as documented in Ref. :cite:`Juba2016`

5.1.x : Replaces the k-d trees with axis-aligned bounding box data structure and includes 
the ability to read voxels in addition to spheres as input

5.2.x : Core functionality (that is, not involving input/output) was moved into a shared library

5.3.x : Adds support for trajectory input