Update INSTALL_pack_mesonh for HPC
Add rain_ice_red to the list of files to be suppressed for mesonh
Add .gitignore into tracked files

prep_code used in check_commit_mesonh.sh
--expand option to expand array-syntax into do loops
preparation for other test cases inclusion

shebang for compare.py
Use of diff instead of cmp
Final message print

REPRO48 variable
big_3D case added to ALL case on HPC

Hard coded path are removed
env.sh added to hep update environment variables (in particular PATH)
Update the separator used to build pack directori names