new model types are made available within the package namespace. Hence, there is no need to call PCMGenerateModelTypes() after loading the package. Call PCMModels() after loading the package to see which are these model types.
Updated tests and examples due to a change in the default random generator type (see https://developer.r-project.org/blosxom.cgi/R-devel/NEWS/2019/02/28#n2019-02-28).