Registration not working with ITK-Elastix 0.21.0

[yoda-vid]

I've been getting a segmentation fault when registering images using itk-elastix v0.21.0. The top of the error message is:

Windows fatal exception: access violation

Current thread 0x00000edc (most recent call first):
  File "my_env\lib\site-packages\itk\ITKCommonBasePython.py", line 3115 in UpdateLargestPossibleRegion

Workaround is to pin the dependency to the prior version: itk-elastix==0.20.

[yoda-vid]

Workaround implemented in PR #682.