How should we handle backward compatibility for the roles?
Specifications in saved games from <= 0.10.5 will not have a <roles>
section.  >= 0.10.6 have a roles section with two bugs: omitted
model.role.default and model.role.scout does not include the
captureUnits ability.  I can not think of anything better than just
brutally checking if each role exists or not and doing a hardwired add
like we do with new options, e.g.

    if (spec.getRole("model.role.soldier") == null) {
        Role role = new Role("model.role.soldier", spec);
        role.set...stuff
        spec.addRole(role);
    }

Did you have anything better in mind?

Cheers,
Mike Pope

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