misc meshio fixes

[hhirtz]

No description provided.

[codecov]

Codecov Report

Base: 51.42% // Head: 51.41% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (4838911) compared to base (c59178b).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #239      +/-   ##
==========================================
- Coverage   51.42%   51.41%   -0.01%     
==========================================
  Files          36       36              
  Lines        6806     6809       +3     
==========================================
+ Hits         3500     3501       +1     
- Misses       3306     3308       +2     

Impacted Files	Coverage Δ
tools/mesh-io/src/medit/parser.rs	48.60% <0.00%> (ø)
tools/mesh-io/src/medit/serializer.rs	51.88% <0.00%> (-1.52%)	⬇️
src/algorithms/vn/first.rs	91.22% <0.00%> (+0.87%)	⬆️

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