One year ago this month, a DuPage County man had his murder and arson conviction for the 1995 death of his mother-in-law vacated after spending more than two decades in prison.The evidence that convinced a judge to order a new trial in William Amor’s case last April involved insight that fire investigations didn’t have in the 1990s.At the time of the fire on Sept. 10, 1995, Amor was living with his wife Tina Miceli in a Naperville apartment with Tina’s mother Marianne Miceli. All three were cigarette …