More traits for DistanceMap

[jwodder]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 45.83333% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.76%. Comparing base (bb18d2a) to head (b9e7151).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
adventutil/src/lib.rs	40.00%	12 Missing ⚠️
2016/24b/src/main.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #214      +/-   ##
==========================================
- Coverage   73.80%   73.76%   -0.04%     
==========================================
  Files         403      403              
  Lines       22063    22077      +14     
==========================================
+ Hits        16283    16286       +3     
- Misses       5780     5791      +11     

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