get_scenario_name_list: Get name list of scenarios in IAMC formatted data frame
Description
select name of scenarios from the column "scenario" then make unique it.
output is character vector such as,
c("EMF27-450-Conv", "EMF27-450-FullTech", "EMF27-450-NoCCS", "EMF27-450-NucOff")
Usage
get_scenario_name_list(D)
Arguments
D
A quitte format dataframe of IAMC data to produce graph.