Philippe 06/09/2023: unset MAKEFLAGS in all job_make_examples_* jobs (to prevent problems with multiple commands launched in parallel if MAKEFLAGS='-j xx' previously set)

Quentin 05/09/2023: update 5.6.1 for jobs, configure, version, A-INSTALL + remove one print on modd_sensor.f90

* always set MNH_REAL (8 by default)
* MNH_REAL has to be set to 4 or 8 (and not R4 or R8)
* XYZ is slightly modified to contain ...-ARCH-RxIy-...
* pass MNH_REAL to pre-processing
* replace MNH_REALS by MNH_REAL

(cherry picked from commit 4691b211)

This reverts commit 4dae8a7e.