By Mehreen Zahra-Malik ISLAMABAD (Reuters) - Former President Pervez Musharraf fled a courtroom on Thursday after judges ordered his arrest to answer allegations he committed treason in 2007, an ignominious retreat for a man who once dominated Pakistan and had hoped to revive his political fortunes. Pakistani television broadcast footage of Musharraf dashing from Islamabad High Court in a black SUV as several lawyers made half-hearted attempts to pursue his vehicle - a scene that would have been unthinkable when Musharraf was at the height of his powers. ...