Fix harness_error's printing of error stacks, put run_next_test into a setTimeout to fix an error when running more than one Mochitest
Fix harness_error's printing of error stacks, put run_next_test into a setTimeout to fix an error when running more than one Mochitest

nils-ohlmeier/steeplechase,sydvicious/steeplechase,luser/steeplechase,mozilla/steeplechase,sydvicious/steeplechase,luser/steeplechase,mozilla/steeplechase,nils-ohlmeier/steeplechase,sydvicious/steeplechase,mozilla/steeplechase,nils-ohlmeier/steeplechase,mozilla/steeplechase,nils-ohlmeier/steeplechase,sydvicious/steeplechase