nanshe/nanshe/registration.py: Use a masked array for registered frames instead of a normal NumPy array.
nanshe/nanshe/registration.py: Use a masked array for registered frames instead of a normal NumPy array.

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