Returns cropping intensity according to LandInG data given the chosen scenario
Arguments
- scenario
"total": currently multicropped areas calculated from total harvested areas and total physical areas per cell from readLandInG "crop" (crop-specific), "irrigation" (irrigation-specific), "irrig_crop" (crop- and irrigation-specific)
- selectyears
Years to be returned
- sectoral
"kcr" MAgPIE crop types, and "lpj" LPJmL crop types