Jan Burse, created May 17. 2019
* Bidirectional parser via CLP(FD) in Prolog.
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* Obtained rights, copyright notice found in ZIP by Michael Hendricks
* http://github.com/mndrix/roman/archive/v0.1.0.zip from 2015-07-10:
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% roman(+-Integer, -+List)
% digits(+-Integer, -+List, +-List)
% digits2(+-Integer, -+List, +-List)
% digit(+-Integer, -+List, +-List)
% ?- roman(14, X), atom_codes(Y, X).
% X = [88,73,86],
% Y = 'XIV'
% ?- atom_codes('XIV', Y), roman(X, Y).
% Y = [88, 73, 86],
% X = 14.