Purpose of this PR

• Fixes a bug introduced by Check if input_bau.gdx is given or really needed; a couple of minor changes mostly related to MAgPIE coupling #1366
• In scenario_config.csv, the SSP5-PkBudg500 scenario had path_gdx_bau set to SSP5-NPi but did not have carbonprice or carbonpriceRegi to NDC. So the check @dklein-pik introduced set path_gdx_bau to NA, which is correct.
• But: as this was done once the cfg list was obtained, the SSP5-NPi run still thought SSP5-PkBudg500 had him as a dependency, and therefore started it again (happened in the AMT runs):
• This PR fixes this error twofold:
  • First, I add the check and fix earlier, in readCheckScenarioConfig to make sure all runs know about the changed dependencies
  • Second, while starting subsequent runs, the script now checks whether the gdx is actually still needed, and if not, skips the run to avoid starting it multiple times.
• I kept the check that @dklein-pik added in checkFixCfg. First, redundancy is not bad ;). Second, I think we still need that because you could still reintroduce such a wrong dependency by having path_gdx_bau set in scenario_config_coupled.csv, but as readCheckScenarioConfig cannot know what value carbonprice has in scenario_config.csv (so without coupled), we have no way to avoid that except at this later stage (which is why David and myself agreed to put it there in the first place).

Type of change

• Bug fix

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
• All automated model tests pass (FAIL 0 in the output of make test)
• All automated coupled model tests pass (FAIL 0 in the output of make test-coupled-slurm)
• I did not update the changelog

for the record: AMT runs that were started twice:

SSP5-PkBudg500-AMT_2023-07-29_01.57.52     7.8 hours    55/100   converged
SSP5-PkBudg500-AMT_2023-07-29_00.46.54     7.7 hours    54/100   converged
SSP5-PkBudg1150-AMT_2023-07-29_01.58.01    7.2 hours    52/100   converged
SSP5-PkBudg1150-AMT_2023-07-29_00.47.02    7.6 hours    61/100   converged
SSP1-PkBudg500-AMT_2023-07-29_00.59.39     5.6 hours    46/100   converged
SSP1-PkBudg500-AMT_2023-07-29_00.46.39     5.6 hours    46/100   converged
SSP1-PkBudg1150-AMT_2023-07-29_00.59.47    4 hours      32/100   converged
SSP1-PkBudg1150-AMT_2023-07-29_00.46.46    4 hours      32/100   converged