run all output scripts on one slurm, improve logging

[orichters]

Purpose of this PR

• add --vanilla to Rscript calls within GAMS to suppress hundreds of Global .Rprofile loaded! (R version 4.1.2 (2021-11-01)) lines in the logs.
• In output.R, if you select single but then choose more than one output script (say: reporting + rds_report + emulator for a coupled run), they were all run on separate slurm jobs, sometimes interfering with each other, or one script needed the output of the other, which creates a big mess. I propose to run each outputdir in one slurm job, but all the scripts selected one after the other in this one job. This allows you to actually select a chain of output scripts that need each other, instead of having them interfere with each other.
• in scripts/input/exoGAINSAirpollutants.R, improve the logging which file is used.
• in start.R, also look into config if you find the config file there. I struggled quite a bit with the warning that the file could not be found, although it was clearly in the config folder, except I forgot to add the config/ part in the command line. Make sure this does not happen anymore to anyone.

Type of change

• Bug fix
• Refactoring

Checklist:

• My code follows the coding etiquette
• I performed a self-review of my own code
• I explained my changes within the PR, particularly in hard-to-understand areas
• I checked that the in-code documentation is up-to-date
• I did not adjust the reporting in remind2
• All automated model tests pass (FAIL 0 in the output of make test)

[LaviniaBaumstark]

thanks for all the cleaning

[LaviniaBaumstark]

I like your proposal to run more than one R-scripts in one slurm job to avoid mess

[0UmfHxcvx5J7JoaOhFSs5mncnisTJJ6q]

I'll state to obvious (at least obvious to anyone who read the R man page):
this deactivates the renv, making consistent results from REMIND runs a gamble once the versions of the packages required by ecoGAINSAirpollutants.R diverge between the renv library and whatever happens to be in R_LIBS_SITE.