FIX: Multi-step registration options

[mgxd]

• Ensure node retrieving intermediate transforms always runs, as on reruns cache would hit but files were not present.
• Pin to nitransform branch to read in antsApplyTransforms generated H5 files (ENH: Allow ingestion of alternatively grouped CompositeH5s nipy/nitransforms#233)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.17%. Comparing base (7813345) to head (4ab5421).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #424   +/-   ##
=======================================
  Coverage   56.17%   56.17%           
=======================================
  Files          70       70           
  Lines        6653     6653           
  Branches      827      827           
=======================================
  Hits         3737     3737           
  Misses       2712     2712           
  Partials      204      204           

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