Refactoring start scripts: adapt coupling scripts, call SLURM directly without the detour via cmd files

Refactoring start scripts: - delete start_functions.R because all it's functions have been replaced by new ones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

Refactoring - delete realization linadjust of module 45_carbonprice, general code cleaning (mainly start_functions.R)

             - remove old_cluster