By Malia Mattoch McManus HONOLULU (Reuters) - The city of Detroit may be facing a deepening financial crisis but that hasn't stopped four trustees of its public pension funds from spending $22,000 of retirement system funds to attend a conference in Hawaii this week. The trip 4,500 miles west to a four-star resort on the world-famous Waikiki Beach in Honolulu doesn't sit well with the top officials now running Detroit's finances under an emergency order from the state of Michigan. ...