- makes it executable from the command line without invoking Rscript
  explicitly
- saves on typing, makes for more relaxed REMIND work ;)

- testOneRegi runs are useful for fast development iterations ("do these
  changes break the model, or does it still run"), so setting them up
  should be fast as well

- supplying the parameter "--testOneRegi" to start.R will ignore any
  scenario_config file provided and modify the default configuration to
  start a testOneRegi run in the directory output/testOneRegi with no
  output processing
- the old oneRegi.R script and oneRegi.cfg configuration are deleted

- existing output/testOneRegi directories are overwritten

Refactoring start scripts: - delete start_functions.R because all it's functions have been replaced by new ones
- fix bugs and correct formatting in other files

Refactoring start scripts: - moved the definition of the slurm strings from  submit() in submit.R to choose_submit() in start.R
- renamed the function choose_submit() to choose_slurmConfig() and moved it to the new file choose_slurmConfig.R

Refactoring: -start scripts (part 5): renamed submit_run(cfg) into submit.R(cfg), deleted conopt files

Refactoring: - part 2: restructure start scripts (try to minimize workload for the login node on the cluster when starting a REMIND run by moving code into scripts that are included in the slurm job)

Refactoring: - restructure start scripts (try to minimize workload for the login node on the cluster when starting a REMIND run by moving code into scripts that are included in the slurm job)