FRANKFURT, Feb 4 (Reuters) - To mark a century since its founding, Germany's Lufthansa is reappraising its history to take on greater responsibility for its actions during the Nazi era, breaking with earlier attempts to separate its pre- and post-war identity. "We at Lufthansa are proud of what we are today," CEO Carsten Spohr told journalists in remarks released on Wednesday. "To then ignore the difficult, dark, terrible years would simply have been dishonest." Sign up here. Lufthansa's board and supervisory board members had joined the Nazi Party from 1930 onwards and, as the state airline, it carried government officials....