NJOY2016.55

This release addresses issue #143

For incident alpha particles, acer assumes that when MT22 is present, the MF6 entry also contains the outgoing alphas for this reaction. When an evaluation is incomplete because this outgoing particle is missing from the MF6 section, this is not detected and thus results in a corrupted ace file. This can generally happen for any incident particle type. This release detects the absence of the outgoing particle and terminates NJOY gracefully.