Allow adjusting of module install subdirectory

[awvwgk]

See toml-f/toml-f#51

[codecov]

Codecov Report

Merging #26 (9630564) into main (8d63934) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #26   +/-   ##
=======================================
  Coverage   64.25%   64.25%           
=======================================
  Files          52       52           
  Lines        4792     4792           
  Branches     1561     1561           
=======================================
  Hits         3079     3079           
  Misses        636      636           
  Partials     1077     1077           

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