ENH: Minor refactor reorganizing base workflows, in prep for #97

[oesteban]

Just to make the diff of #97 a bit cleaner.

[pull-assistant]

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     enh: minor refactor reorganizing base workflows, in prep for #97

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[codecov]

Codecov Report

Merging #110 into master will decrease coverage by 0.55%.
The diff coverage is 14.28%.

@@            Coverage Diff             @@
##           master     #110      +/-   ##
==========================================
- Coverage   51.92%   51.37%   -0.56%     
==========================================
  Files          20       20              
  Lines        1221     1238      +17     
  Branches      161      162       +1     
==========================================
+ Hits          634      636       +2     
- Misses        575      590      +15     
  Partials       12       12              

Impacted Files	Coverage Δ
dmriprep/workflows/dwi/base.py	47.05% <ø> (+2.61%)	⬆️
dmriprep/workflows/dwi/util.py	21.15% <11.76%> (-3.85%)	⬇️
dmriprep/workflows/base.py	22.35% <25.00%> (-0.54%)	⬇️

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[josephmje]

Thanks @oesteban . This looks good to me! I had a question about the _normalize() function. Is it meant to remove negative values in the data or simply fix the range of intensity values?