Compute accurately dist along array

[Mikejmnez]

While checking the issue #359, I realized I was computing the distance along an array wrong, and this PR corrects it.

[codecov[bot]]

Codecov Report

Merging #361 (c05dafe) into main (954984d) will decrease coverage by 0.10%. The diff coverage is 82.75%.

@@            Coverage Diff             @@
##             main     #361      +/-   ##
==========================================
- Coverage   94.78%   94.68%   -0.10%     
==========================================
  Files           9        9              
  Lines        3932     3954      +22     
  Branches      924      933       +9     
==========================================
+ Hits         3727     3744      +17     
- Misses        129      132       +3     
- Partials       76       78       +2     

Flag	Coverage Δ
unittests	94.68% <82.75%> (-0.10%)	:arrow_down:

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Impacted Files	Coverage Δ
oceanspy/subsample.py	96.50% <82.75%> (-0.82%)	:arrow_down:

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[Mikejmnez]

This PR is not ready to be merged yet. I am working on still working on fixing the path of the array... (see #359)