Well Named Graphs

[robertmuil]

Fixes #32
Fixes #37

Have now a well-defined minting process for graph IDs using relative file names. Use http:// IRIs instead of urns unfortunately, perhaps that can be changed in future.

Have also added provenance information into output to track files.

[codecov]

Codecov Report

❌ Patch coverage is 96.77419% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.92%. Comparing base (cb7240a) to head (743f2cd).
⚠️ Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
src/pythinfer/inout.py	92.59%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #38      +/-   ##
==========================================
+ Coverage   81.99%   82.92%   +0.93%     
==========================================
  Files           5        5              
  Lines         572      615      +43     
  Branches       95       95              
==========================================
+ Hits          469      510      +41     
- Misses         81       83       +2     
  Partials       22       22              

Flag	Coverage Δ
unittests	82.92% <96.77%> (+0.93%)	⬆️

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