Warning added to process_cut if expected dataset dm is missing (#172)
Warning added to create_dcut if cut date being passed as NULL, and not valid date or NA/"" (#181)
process_cut updated so that the patient_cut_v, date_cut_m and no_cut_v arguments have a default value of NULL (#188)
process_cut updated to have more detailed error messages when incorrect datasets are fed in (#180)
process_cut updated to have arguments read_out and out_path to integrate the read_out function into the wrapper function; enabling auto-generation of the datacutr read-out file (#107)