"The statute forbids all abortions except those necessary to save the life of the mother. Construing the statute to intend its narrowest possible meaning, i.e., that abortions are lawful only when they will prevent certain and imminent death, it is clear that the operation of the statute may deny women abortions when the abortion would prevent injury or safeguard or preserve the patient’s mental or physical health. Thus a woman suffering from heart disease, diabetes or cancer whose pregnancy worsens the underlying pathology may be denied a medically indicated therapeutic abortion under the statute because death is not certain. Such a patient is effectively denied a fundamental constitutional right reserved to her under the Ninth Amendment—the right to medical treatment..."