Added standard InChi key & string for n-Undecane
Added standard InChi key & string for n-Undecane

Values obtained from: https://pubchem.ncbi.nlm.nih.gov/compound/14257#section=Names-and-Identifiers
CoolProp/CoolProp,henningjp/CoolProp,henningjp/CoolProp,henningjp/CoolProp,henningjp/CoolProp,CoolProp/CoolProp,henningjp/CoolProp,CoolProp/CoolProp,CoolProp/CoolProp,CoolProp/CoolProp,CoolProp/CoolProp,henningjp/CoolProp,CoolProp/CoolProp,CoolProp/CoolProp,henningjp/CoolProp,henningjp/CoolProp