API packaging

[godotalgorithm]

This is a minor adjustment so that MOPAC's standard distribution contains an include directory with mopac_api.F90 so that programs can build a .mod file for interfacing with MOPAC's API when linking with MOPAC as a shared library. Also, I've moved the API tester outside of the main CMake file so that it is only built if testing is turned on.

Status

• Ready for merge

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.

Project coverage is 67.93%. Comparing base (f2cb511) to head (3687fd6).
Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
src/interface/mopac_api_operations.F90	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #216      +/-   ##
==========================================
- Coverage   67.93%   67.93%   -0.01%     
==========================================
  Files         336      336              
  Lines       77018    77025       +7     
==========================================
  Hits        52326    52326              
- Misses      24692    24699       +7     

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