ENH: Enable antsRegistration 2.2.0+ masking

[effigies]

Changes proposed in this pull request

• Add fixed/moving_image_masks input spec entries, mutually exclusive with the singular versions
  • New entries are min_ver=2.2.0
  • Plural reflects that each mask can be set per-transform stage
• Old entries set to max_ver=2.1.0; they produce different command-lines
• AntsCommand is given a usable version property, based on running antsRegistration --version

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Old PR text, for context.

Changes proposed in this pull request

• Add missing import

Bug introduced in #2070.

[effigies]

Turns out I failed to hook up these inputs, so the downstream testing I was doing was worthless. Added a doctest, which found another bug.

Ready for review.

[effigies]

It turns out this is a post 2.1.0 development... Reverting #2070 and will update the input spec accordingly.

[codecov-io]

Codecov Report

Merging #2078 into master will decrease coverage by 0.02%.
The diff coverage is 40.47%.

@@            Coverage Diff             @@
##           master    #2078      +/-   ##
==========================================
- Coverage   72.16%   72.13%   -0.03%     
==========================================
  Files        1138     1138              
  Lines       57229    57268      +39     
  Branches     8199     8206       +7     
==========================================
+ Hits        41301    41313      +12     
- Misses      14638    14663      +25     
- Partials     1290     1292       +2

Flag	Coverage Δ
#smoketests	72.13% <40.47%> (-0.03%)	⬇️
#unittests	69.75% <40.47%> (-0.03%)	⬇️

Impacted Files	Coverage Δ
...pe/interfaces/ants/tests/test_auto_Registration.py	85.71% <ø> (ø)	⬆️
nipype/interfaces/ants/base.py	51.72% <25.92%> (-23.28%)	⬇️
nipype/interfaces/ants/registration.py	74.21% <66.66%> (-0.45%)	⬇️
nipype/interfaces/base.py	83.8% <0%> (-0.19%)	⬇️

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[effigies]

Status: I can run the desired command in ANTs 2.1.0 (though it crashes; it seems they changed how they did masking). I'm upgrading our setup to ANTs 2.2.0, so I'll be able to test it today.

[effigies]

Status: I'm able to use this to pass a mask in ANTs 2.1.0; I'll test with 2.2.0 today.

[satra]

@effigies - for nipype containers, we should move over to neurodebian install for ants to minimize footprint, now that the latest version is available there.

[effigies]

@satra Done.