v2.1.0

v2.1.0 (january 2025): enforce a stabilized version of the v2.0.0 release train
- update date 2024-2025 in cawk root directory
- change checkdiff output generated by to be compliant with all linux/unix systems (default sort output may differ from os to os)
- add <.gitkeep> in all empty cawk directories to avoid that empty directories are not pushed in github
- enforce that the repository is a full copy of the repository
- add a new target gicheckdist (implement counter-measures checks) in cawk Makefile to avoid deployment errors before github push
- optimize the cawk root Makefile for future supplier os deployment
- provide the procedure to submit a pull request