 matrix population models with the <code>matrix_model</code> function, along with its helper functions <code>colored_multi_rnorm</code>, <code>multi_rnorm</code>, and <code>cor2cov</code>.</li>
<li>Renamed <code>raw_noise</code> to <code>colored_noise</code> and <code>timeseries</code> to <code>unstructured_pop</code>.</li>
<li>The package now has a more extensive testing suite.</li>
</ul>
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