moving config_reader
add paper1 configuration
the parse test fails currently - great!
added test_parser option for the parser.
working on paper1 parser
changed call signatures of symbol2atomic_number requiring functions.
shifted data to data directory
working on class testing
updated the format and fixed the tests
refactor to take tardis name out.
refactoring the config reader code
refactoring more about the exceptions. rejigging the configuration
added parse_quantity_linspace
finished the restructure of the config reader. checking for consistency
implementing reading ascii files
added more tests for the config_reader.
added more data files
added tests for artis model reader
finished testing the abundance ascii reader.
implemented v_inner and v_outer boundary