Deal with minimal population sizes and budgets in Nevergrad #37
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Some algorithms have minimal sample sizes (e.g. 30 for DE, 40 for PSO), and some of them break if we manually set them lower. With this PR, the user gets a warning that the requested sample size will not be used. Some algorithms do not support parallelization at all, this will also trigger a warning (and a use of sample size 1) now. Finally, we now set the "budget", since some algorithms require it.