SPRINGFIELD — Alan Beaman, exonerated after 13 years in prison for the 1993 murder of his ex-girlfriend, is now looking forward to a trial.The Illinois Supreme Court will be looking into Beaman’s claims against three former police officers and the town of Normal. When the court takes up the case, it could reverse its course after initially turning away his petition last fall.His lawyers have argued the appropriate first step in proving a malicious prosecution tort against the police officers is to prove they …