Don't do symlinks

[gbrammer]

Set eazy.utils.DATA_PATH to the eazy-photoz subdirectory itself without making symlinks, which could be a bit fragile across different system architectures.

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 62.63%. Comparing base (828db5a) to head (452ce07).
Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
eazy/__init__.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #54      +/-   ##
==========================================
- Coverage   62.67%   62.63%   -0.04%     
==========================================
  Files          14       14              
  Lines        5375     5372       -3     
==========================================
- Hits         3369     3365       -4     
- Misses       2006     2007       +1     

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