5.2.0 beta

This is a beta release for the 5.2 version. There has been a lot of refactoring in the EnsembleMethod class to support weight ensembles throughout the code, new support for rebalancing weights by realization (#216), as well as a lot refactoring in the multimodal solve to support multithreading (#221). Also some new approaches and refactoring in the autoadaloc calculations (#225). Several bug fixes along the way too (#227 , #231 , @cnicol-gwlogic - fix in mou risk-as-an-obj, etc). Please provide any feedback in the discussion - thanks in advance!