Adding the Dagstuhloid benchmark and many more metamodels

Inspired by discussions at the Dagstuhl seminar, and others.

What's Changed

• Update bench.txt by @teytaud in #1522
• Voronoi differential evolution, first draft by @teytaud in #1523
• adding another CMA and a Bipop by @teytaud in #1524
• new metamodels by @teytaud in #1517
• topology optimization artificial benchmark by @teytaud in #1525
• bfgs by @teytaud in #1532
• Update utils.py for fault tolerance by @teytaud in #1496
• Implementation of a Dagstuhloid benchmark, i.e. a benchmark inspired by discussions at Dagstuhl by @teytaud in #1531

Full Changelog: 0.7.0...v0.8.0