ENH: Add DWI volume plot method

[jhlegarreta]

Add DWI volume plot method.

[jhlegarreta]

Test data missing in here: tested with ds000114 from openneuro. Probably too large (104 MB) to add it here. Let me know which other dMRI volume that you know we could use.

[effigies]

Added a downsampled and truncated copy of the indicated file. 3.5MB, which seems a reasonably modest addition and will be excluded from wheels.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.45%. Comparing base (977f26a) to head (ba1f12a).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #101      +/-   ##
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+ Coverage   58.43%   58.45%   +0.01%     
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  Files          22       22              
  Lines        2086     2094       +8     
  Branches      364      322      -42     
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+ Hits         1219     1224       +5     
- Misses        783      787       +4     
+ Partials       84       83       -1     

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unittests	58.45% <100.00%> (+0.17%)	⬆️

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[jhlegarreta]

Added a downsampled and truncated copy of the indicated file. 3.5MB, which seems a reasonably modest addition and will be excluded from wheels.

Thanks for working on this Chris 💯. The bvals and bvecs have not been truncated, though, and even if the test is passing, the gradient direction may not correspond to the one that is displayed.

IMO best would be to rename the DWI test file to clearly state that its has been truncated (and to reduce confusion with the original image on OpenNeuro), and add the matching bval/bvec pair.

Can you please do this @effigies ?

[jhlegarreta]

Thanks Chris. Merging.