[FIX] Register __del__ method of TwinModel to avoid issue atexit

[lboucin]

@chrpetre The error raised at the end of the example script execution was due to python interpreter calling the cleanup method register to atexit module in the pytwin.settings module before to call the del method of the TwinModel.

There was no issue if the example business logic is encapsulated into a main method and the main method called at the end of the script. I think this due to the order in which methods are registered by the interpreter, which follow a last in, last out pattern at process exit.

The solution I found is to explicitly register the del method of TwinModel object to the atexit module. When importing pytwin, the init.py script in called, and then the registration of the del method is done after the registration of the settings.cleanup_temp_pytwin_working_directory method, which should avoid it to try deleting log file of the runtime of the TwinModel before it to be closed.

[codecov-commenter]

Codecov Report

Merging #116 (64406aa) into main (6b860f5) will decrease coverage by 0.19%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #116      +/-   ##
==========================================
- Coverage   89.04%   88.86%   -0.19%     
==========================================
  Files          11       11              
  Lines        2336     2334       -2     
==========================================
- Hits         2080     2074       -6     
- Misses        256      260       +4     

[chrpetre]

thanks Lucas