Refactoring start scripts: fix bug in sbatch command, remove scenario name from name of log.txt so the rs script can easily find it.

Refactoring start scripts: - delete start_functions.R because all it's functions have been replaced by new ones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)