MAINT: avoid deprecation warnings

[mgxd]

Summary

Fixes #2890.

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

• Reduce deprecation complaints:
  • import of numpy decorators
  • pytest.raises() deprecated keyword (drop custom message)
  • fix dipy import error for latest release (0.16) Removed/renamed DetTrackPAMFlow? dipy/dipy#1794

Acknowledgment

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

[codecov-io]

Codecov Report

Merging #2903 into master will decrease coverage by 0.66%.
The diff coverage is 25%.

@@            Coverage Diff            @@
##           master   #2903      +/-   ##
=========================================
- Coverage   67.56%   66.9%   -0.67%     
=========================================
  Files         343     342       -1     
  Lines       43601   43583      -18     
  Branches     5427    5424       -3     
=========================================
- Hits        29460   29160     -300     
- Misses      13436   13699     +263     
- Partials      705     724      +19

Flag	Coverage Δ
#smoketests	50.47% <ø> (ø)	⬆️
#unittests	64.05% <25%> (-0.95%)	⬇️

Impacted Files	Coverage Δ
nipype/testing/decorators.py	66.66% <25%> (ø)	⬆️
nipype/interfaces/nilearn.py	40% <0%> (-56.67%)	⬇️
nipype/interfaces/dipy/registration.py	55.55% <0%> (-44.45%)	⬇️
nipype/testing/fixtures.py	77.33% <0%> (-21.34%)	⬇️
nipype/interfaces/freesurfer/base.py	61.01% <0%> (-19.5%)	⬇️
nipype/interfaces/dipy/base.py	60.36% <0%> (-16.22%)	⬇️
nipype/workflows/dmri/fsl/tbss.py	77.47% <0%> (-11.72%)	⬇️
nipype/workflows/smri/freesurfer/autorecon2.py	65.9% <0%> (-9.2%)	⬇️
nipype/interfaces/ants/base.py	63.82% <0%> (-8.52%)	⬇️
nipype/workflows/smri/freesurfer/ba_maps.py	91.66% <0%> (-8.34%)	⬇️
... and 13 more

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