Version 0.2.0 release - censored data and argparse interface

Updates in this version

• changing resolve_name_generic() (one of the functions in the auxiliary_info class) to also return the RACS_ID of the input source, which is needed if you are using retrieve_fluxdata_remote()
• Implemented an argparse interface which can be used by calling run radiosed.py -h (or using other appropriate arguments)
• ability to fit censored data (i.e. upper limits on non-detections) by passing in custom flux density measurements. See the example flux file under the example_files folder for the structure required when passing in censored data
• calculation of the variability index (VI) for ALMACAL data is done by default as part of the SEDDataParser flux density compilation
• additional minor bug fixes

Full Changelog: v0.1.0...v0.2.0