Additional unit tests for LeidenDatabase, LOVD2Database, and LOVD3Database.
Added methods for extracting CHROM #, COORDINATE, REF, and ALT from remapped notation. Implemented corresponding unit tests.
Made use of input/result declarations consistent in all unit tests. Makes creating new test cases much easier as parameter names do not need to be changed.
Added additional unit test cases if invalid mappings are passed to methods for getting CHROM #, COORDINATE, REF, and ALT.
Working variant notation conversion to CHROM #, COORDINATE, REF, ALT in output files. Need to ensure DMD and empty entries are unaffected by changes.