nanshe/io/xtiff.py: Use `tifffile` to extract the image description metadata instead of using `pylibtiff`.
nanshe/io/xtiff.py: Use `tifffile` to extract the image description metadata instead of using `pylibtiff`.

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