add repo_data_only flag (#1)

added uk legislation

fixed dumm errors with loading script

added jurisdiction default value and added more datasets to dataset_loader script

added more information in case of failure

added more information in case of failure

fixed bug

fixed bugs

removed more data from pile-of-law, added more documentation and added three more datasets

removed borderline legal data originating from pile-of-law

fixed bug

added first version of the Multi_Legal_Pile