title: Pagmo2 Pygmo2 warm start capablities
body: <p>I am experimenting with <a href="https://esa.github.io/pagmo2/" rel="nofollow noreferrer">Pygmo</a> and find it very convenient for setting up global optimization tasks. However, it would be great to have more CPU cores (>32) which I do not have on my computer. I would like to keep everything as cost efficient as possible and thought about using either an AWS spot instance or a preemptive VM instance on a google cloud instance. Because the instance can be shutdown at any time, I need some warm start capability. I found a <a href="https://esa.github.io/pagmo2/search.html?q=save&amp;check_keywords=yes&amp;area=default" rel="nofollow noreferrer">archipelago::save</a> function in the API but do not understand if this function can be used to save the state of the optimizer. Is it possible to warm start Pygmo/Pagmo2 ?</p>