Get user metadata about all of the users that have access to a particular
Crunch object like a dataset or project. Returns a UserCatalog object which
can be translated into a data.frame with catalogToDataFrame() if information
needs to be extracted, queried, transformed, etc.
users(x)
# S4 method for class 'CrunchDataset'
users(x)
# S4 method for class 'DatasetTuple'
users(x)
# S4 method for class 'ProjectFolder'
users(x)a UserCatalog with information about users who have access to the
dataset