Change in energy_p_new_barrier.F, in eelec, aorund line 3065

Change in energy_p_new_barrier.F, in eelec, aorund line 3065
 Because in general iturn3_start and iturn3_end are nnt and nct-3,
respectively, if the chain has a GLY as the first or last residues,
nnt=1 or nct=nres, the program ends up evaluating itype(0) or itype(nres+1).
The first case causes a segmentation fault, the second won't (if maxres is
bigger than nres), but it won't cycle the loop which is what was intended