By Andrew MacAskill LONDON (Reuters) – British Prime Minister Liz Truss’s insistence that she would not quit after sparking a financial crisis was met with howls of laughter, incredulity and shouts of “resign, resign” as she spoke in the House of Commons on Wednesday. Fighting for her political survival, Truss often had to pause to be heard as her insistence that she had been “very clear” and that the opposition party needed to grasp “economic reality” was met with jeers and calls for her to go. “I am a fighter and not a quitter,” she told a packed session of “Prime Minister’s Questions” – a w…