nanshe/nanshe/registration.py: Changed dtfreg_fast_shifts to remove global shifts. In other words, when all frames have drifted in the same direction. This results in an unnecessary loss of information.
nanshe/nanshe/registration.py: Changed dtfreg_fast_shifts to remove global shifts. In other words, when all frames have drifted in the same direction. This results in an unnecessary loss of information.

DudLab/nanshe,jakirkham/nanshe,nanshe-org/nanshe,DudLab/nanshe,nanshe-org/nanshe,jakirkham/nanshe