move scripts for magicc into the folder core/magicc, delete outdated script performance_test.R, integrate script submit_compare.cmd into multiComparison.R

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* Deleted q30_pebiolc_price_base and vm_pebiolc_price_shifted since it was a remainder of old implementations and had no function anymore.

These are mainly naming inconsitencies in the welfare module.

This is part of a larger refactoring effort of the remind core.
Here, code related to the social welfare functions has been moved
from the core to the new module. Some renaming was required. For
now, only one module realization exists, 'utilitarian', which
corresponds one to one to what was in the core before. This
refactoring exercises has no effect on the results!

Revert "*bugfix* fixed p_GDPpcScen definition and added SDP as scenario. Corrects p_developmentState and the phase-in of MAgPIE CO2 price"

This reverts commit 844132d2.

Correct description of incolearn

Correct description of incolearn

Correct description of incolearn

*bugfix* fixed p_GDPpcScen definition and added SDP as scenario. Corrects p_developmentState and the phase-in of MAgPIE CO2 price

*gdx neutral* Follow up to previous commit: replaced hard coded reduction factor for price on CO2-LUC with new parameter defined in default.cfg