Wavelength calculation

It does not make any difference in practice, but just for mathematical
accuracy, I think the following line in ctffind3.f

WL=12.3/SQRT(KV+KV**2/(10.0**6.0)) ! Angstroms

should be

WL=12.26/SQRT(KV+0.9784*KV**2/(10.0**6.0)) ! Angstroms