In 1993, a 16-year-old girl was allegedly held captive inside a Concord motel for about a week and repeatedly raped. Her assailant? A man paid by the state of New Hampshire to care for troubled youth. The case of Jane Doe 73, shocking as it is, could be overlooked as the public focuses on the ongoing Sununu Youth Development Center (YDC) abuse scandal. But details in this horrific case, set for trial in June, could force New Hampshire to confron…