e <code>cmdstan</code> module;
the Stan inference engine algorithms and Stan math library functions
are specified as <a href="https://git-scm.com/book/en/v2/Git-Tools-Submodules">submodules</a>
and stored in the GitHub repositories
<a href="https://github.com/stan-dev/stan">stan</a> and <a href="https://github.com/stan-dev/math">math</a>,
respectively.</p>
<p>A <a href="https://github.com/stan-dev/cmdstan/releases">CmdStan release</a> is
compressed tarfile which contains CmdStan and the Stan and math librar