small_3D_alt7: suppression of the RHCJ option
small_3D_alt8: RHCJ case
The RHCJ case cannot be compared to the reference version because
an incompatible changed has been entered during commit 907e9066

small_3D_alt6: RAHA updraft with the bigaussian pdf
small_3D_alt7: RHCJ updraft with the STAT cloud scheme
               and the LOSIGMAS=F option
Two bug corrections in the original version are needed to run
the small_3D_alt7 test case (corrections described in INSTALL_pack_ial

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

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