added an option to exit in rterror() so that Minc parse errors would exit -- BGG
added an option to exit in rterror() so that Minc parse errors would exit -- BGG

RTcmix/RTcmix,RTcmix/RTcmix,RTcmix/RTcmix,RTcmix/RTcmix,RTcmix/RTcmix,RTcmix/RTcmix