Add install target

[attipaci]

Adds a install target to the Makefile, using the standard directory variables, with the recommended default values. As such it can take a prefix argument, e.g.:

  sudo make prefix=/opt install

To install under /opt rather than the default /usr prefix.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.65%. Comparing base (a3e47ac) to head (f58da6f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #94   +/-   ##
=======================================
  Coverage   99.65%   99.65%           
=======================================
  Files           8        8           
  Lines        2904     2904           
  Branches      561      561           
=======================================
  Hits         2894     2894           
  Partials       10       10           

Flag	Coverage Δ
unittests	99.65% <ø> (ø)

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