Implement RR-SW-UCB# and SW-DLP from paper arXiv:1812.05165

[Naereen]

For non-stationary multi-player bandits, the following reference introduce the awesome LM-DSEE and SW-UCB# algorithms: ["On Distributed Multi-player Multi-Armed Bandit Problems in Abruptly Changing Environment", by Lai Wei, Vaibhav Srivastava, 2018, arXiv:1812.05165]. Cf. #183

I need to:

• Write the RR-SW-UCB# algorithm!
• Write the SW-DLP algorithm!
• Implement it in a very generic way, as children of BaseWrapperPolicy, so any index policy can directly be used and not just UCB!
• Test it on simple problems, and check what the authors claim in their paper,
• Compare them with Selfish+SW-UCB# or MCTopM+SW-UCB# (or any efficient non stationary bandit algorithms)