[FIX] change ANTS number_of_time_steps from Float to Int

[BenjaminMey]

Summary

Fixes #3117 .

List of changes proposed in this PR (pull-request)

• Change the trait type for ANTS number_of_time_steps from traits.Float to traits.Int

Acknowledgment

• (Mandatory) I acknowledge that this contribution will be available under the Apache 2 license.

[effigies]

In case you missed from #3117 (comment), if you want this to work for Python 2.7, you're going to need to rebase onto maint/1.3.x.

See https://github.com/nipy/nipype#python-2-statement

[codecov]

Codecov Report

Merging #3118 into master will decrease coverage by 0.04%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3118      +/-   ##
==========================================
- Coverage   67.84%   67.79%   -0.05%     
==========================================
  Files         295      295              
  Lines       39304    39318      +14     
  Branches     5178     5179       +1     
==========================================
- Hits        26664    26654      -10     
- Misses      11934    11954      +20     
- Partials      706      710       +4

Flag	Coverage Δ
#smoketests	51.05% <100%> (-0.18%)	⬇️
#unittests	65.05% <100%> (-0.02%)	⬇️

Impacted Files	Coverage Δ
nipype/interfaces/ants/registration.py	72.83% <100%> (ø)	⬆️
nipype/interfaces/dcm2nii.py	58.68% <0%> (-6.11%)	⬇️
nipype/pipeline/plugins/legacymultiproc.py	59.29% <0%> (-3.52%)	⬇️
nipype/utils/provenance.py	82.58% <0%> (-1.3%)	⬇️
nipype/info.py	93.82% <0%> (-0.21%)	⬇️
nipype/pipeline/engine/nodes.py	83.14% <0%> (-0.17%)	⬇️
nipype/__init__.py	58.06% <0%> (+3.22%)	⬆️

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[effigies]

Merging. I notice that this is a deprecated interface, and that the recommended is ants.Registration, so you might want to consider moving to that, regardless.