changed BaseLoader so that it must used full path

[RJCD-Diamond]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 14.28571% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 37.83%. Comparing base (44fbfc7) to head (4642219).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/xrpd_toolbox/data_loader.py	33.33%	2 Missing ⚠️
src/xrpd_toolbox/i15_1/pe2ad.py	0.00%	2 Missing ⚠️
src/xrpd_toolbox/i15_1/sample_alignment.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #24      +/-   ##
==========================================
- Coverage   37.85%   37.83%   -0.02%     
==========================================
  Files          30       30              
  Lines        4951     4945       -6     
==========================================
- Hits         1874     1871       -3     
+ Misses       3077     3074       -3     

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