Fixing references to w_ee array; using default CC-in2p3 Gitlab CI runners

This merge request replaces references to the old wee array with the w_ee replacement. I have changed all the old references, except for the code related to loading unstructured mesh and some Python scripts (I think wee name is used in the pmesh files). I have also removed/changed some comments (and commented code) related to these references.

This change fixes an error occurring while running Held&Suarez test:

FIXME : wee is deprecated, replace wee(ij,n,1) by w_ee(ij,n) and wee(ij,n,2) by w_ee(ij,n+5)
--------------------------------------------------------------------------
mpirun has exited due to process rank 0 with PID 11248 on
node merlin12-c.climserv exiting improperly. There are two reasons this could occur:
 
1. this process did not call "init" before exiting, but others in
the job did. This can cause a job to hang indefinitely while it waits
for all processes to call "init". By rule, if one process calls "init",
then ALL processes must call "init" prior to termination.
 
2. this process called "init", but exited without calling "finalize".
By rule, all processes that call "init" MUST call "finalize" prior to
exiting or it will be considered an "abnormal termination"
 
This may have caused other processes in the application to be
terminated by signals sent by mpirun (as reported here).
--------------------------------------------------------------------------

Furthermore, due to ongoing work on the IPSL/Kubernetes Gitlab CI runner -- I have changed the runner to the default one offered by in2p3.