- VERBOSE_LBL in basic mod: set the amount of output in the std
- Title: there is now a title with the version of the code

- introduce variables ngX_o2 = ngX/2 where X = p,j,z
- replace all ngX/2 call by a call to ngX_o2
- compiler should optimize it anyway but can we trust it?

- takes as input ref. density temp etc.
- performs the transformation from dimensionless to physical units
- completely optional, everything can be postprocessed as well.
- new option for std output where the fluxes are in MW