Fix 'chunk' in load_process_save_chunk.R

Hi @aho!

In this new branch, I have done the changes working and already installed in Nord3 and WS.

I'll close the other merge request.

Please, take a look and let me know if we need to modify it.

I would prefer to avoid installing more versions right now in the machines since it could interfere with user's analysis. However, we can modify it to submit it to CRAN if necessary.

Cheers,

Núria