FIX: Inconsistent flips of ITK's displacements fields - including loading from h5

[oesteban]

Summary

• verify that points mapped through a composite HDF5 transform agree with antsApplyTransformsToPoints

Testing

• pytest nitransforms/tests/test_io.py::test_composite_h5_map_against_ants -q

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https://chatgpt.com/codex/tasks/task_e_68808465c5e08330a6e9cbb469021814

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 10 lines in your changes missing coverage. Please review.

Project coverage is 0.00%. Comparing base (0ae771d) to head (e48e2c4). Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
nitransforms/io/itk.py	0.00%	7 Missing :warning:
nitransforms/nonlinear.py	0.00%	2 Missing :warning:
nitransforms/resampling.py	0.00%	1 Missing :warning:

:exclamation: There is a different number of reports uploaded between BASE (0ae771d) and HEAD (e48e2c4). Click for more details.

HEAD has 7 uploads less than BASE

Flag	BASE (0ae771d)	HEAD (e48e2c4)
	7	1
unittests	1	0

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #264       +/-   ##
==========================================
- Coverage   95.09%   0.00%   -95.10%     
==========================================
  Files          16      16               
  Lines        1979    1973        -6     
  Branches      265       0      -265     
==========================================
- Hits         1882       0     -1882     
- Misses         77    1973     +1896     
+ Partials       20       0       -20     

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