Allow installation of module files

[awvwgk]

See dftd4/dftd4#95

[codecov]

Codecov Report

Merging #39 (dc4e0c1) into main (cd449a7) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #39   +/-   ##
=======================================
  Coverage   84.86%   84.86%           
=======================================
  Files          41       41           
  Lines        2868     2868           
=======================================
  Hits         2434     2434           
  Misses        434      434           

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